| under
| preposition
| v1
| below or beneath something, or to a lower place.
| She is holding the ball under her arm.
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| undercover
| adjective
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| done in secret to obtain information.
| The police were working on an undercover investigation.
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| underdone
| adjective
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| not cooked for long enough.
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| underground
| adjective
| v1
| below the ground.
| An underground cave
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| underline
| verb
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| to draw a line under something, usually to stress it or to show that it is important.
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| underneath
| preposition
| v1
| below something, or in a lower place.
| The children played underneath the table.
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| understand
| verb
| v1
| to know what something means.
| Did you understand the question?
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| understudy
| noun
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| a person who learns a part in a play or performance so that he or she can take over if the usual actor cannot perform.
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| underwater
| adjective
| v1
| found under the surface of the water, or used under the surface of the water.
| The diver swam among the underwater plants and animals.
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| underwear
| noun
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| the clothes that you wear next to your skin and under your other clothes.
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| undo
| verb
| v1
| to unfasten or untie.
| Undoing a knot in a rope.
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| undress
| verb
| v1
| to take clothes off.
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| uneasy
| adjective
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| not feeling comfortable or happy.
| She felt uneasy about leaving the door unlocked.
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| unemployed
| adjective
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| without a job.
| He’s been unemployed for almost a year
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| uneven
| adjective
| v1
| not smooth or level.
| The road had a very uneven surface.
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| unexpected
| adjective
| v1
| surprising, or happening when you do not think it will.
| The unexpected rain made everyone leave the beach.
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| unfair
| adjective
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| not right or honest.
| That’s unfair! You have more than me!
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| unfortunate
| adjective
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| having or bringing bad luck.
| It was unfortunate that he’d left a roller skate on the floor.
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| unhappy
| adjective
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| sad or miserable.
| She felt unhappy when she failed the exam.
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| unhealthy
| adjective
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| not well or not fit.
| You look unhealthy.
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| unicorn
| noun
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| an imaginary animal in myths and fairy tales. A unicorn is like a horse, but has a long, spiraled horn on its forehead.
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| unicycle
| noun
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| a machine for riding on, with pedals, a saddle, and one wheel.
| Unicycles are sometimes used for performing acrobatic tricks.
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| uniform
| noun
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| special clothes worn by members of a group to show that they belong to that group.
| People in the armed forces, the police force, and some students wear uniforms.
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| union
| noun
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| two or more people, places, or things that are joined together to become one.
| Russia was once a part of the Union of Soviet Socialist Republics.
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| unique
| adjective
| v1
| being the only one of its kind
| Every snowflake is unique.
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| unit
| noun
| v1
| a single part of something.
| A kitchen unit.
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| unite
| verb
| v1
| to join together or to do something together.
| The towns united in their fight against the factory’s pollution.
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| universe
| noun
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| all of space, and everything that exists in it. The universe includes Earth, the other planets, and all the stars.
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| university
| noun
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| a place where students go for the highest level of education.
| Graduating from university with advanced degrees.
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| unkind
| adjective
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| cruel or not caring.
| She was very unkind to her little sister.
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