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( geography ) a small hill of sand near the ocean or in a desert a sand dune

dun • geon / ' dAnd3an / noun [ count ]

a dark, underground room used as a prison the castle dungeons

dunk / dAgk / verb ( dunks , dunk - ing , dunked )

to put something into a liquid for a short time to dunk a cookie into milk

( sports ) (in basketball ) to jump very high and throw the ball hard down into the basket (= the round net )

du • pleX / ' dupleks / noun [ count ] ( plural du - plex . es )

a house that is divided into two separate homes, with a separate door for each one

du • pli • cate / ' duplakeit / verb ( du - pli cates , du - pli - cat ing , du - pli - cat - ed )

to make an exact copy of something

to do something that has already been done

We don't want to duplicate the work of the other departments.

du • ra • ble / ' durabl / adjective

likely to last for a long time without getting weaker a durable fabric

► du • ra • bil • i • ty / |dura'bilati / noun [ noncount ]

dur . inC) Ф" / dung / preposition

all the time that something is happening The sun gives us light during the day.

at some time while something else is happening She died during the night.

I fell asleep during the movie.

dusk / dAsk / noun [ noncount ]

the time in the evening when it is almost dark —Look at dawn .

dust l Ф / cLvst/ noun [ noncount ]

dry dirt that is like powder The old table was covered in dust.

dust 2 / dAst / verb ( dusts , dust ing , dust • ed )

to take dust off something with a cloth I dusted the furniture.

dust • pan / ' dAstpren / noun [ count ]

a flat container with a handle that you use for getting dust

or garbage off the floor

dustpan

dust • y / dAsti / adjective ( dust • i er , dust • i est )

covered with dust

The furniture was very dusty.

du • ti • ful / ' dutifl / adjective

doing everything that you are expected to do a dutiful son

► du • ti • ful • ly / ' dutifli / adverb

He told me to follow him, and I dutifully obeyed.

dil .ty Ф / 'duti/ noun [ count, noncount ] ( plural du • ties )

something that you must do because it is part of your job or because you think it is right

It is your duty to take care of your parents when they get older.

One of the duties of a secretary is to type letters.

money (called tax ) that you pay to the government when you bring things into a country from another country

off duty

not working

The police officer was off duty. on duty

working

Some nurses at the hospital are on duty all night.

du • ty-free / ,duti ' fri / adjective, adverb

Duty-free goods are things that you can bring into a country without paying money to the government. You can buy goods duty-free on airplanes or ships and at airports.

DVD Фу ,di vi 'di / noun [ cou nt ]

( computers ) a small plastic disk that you record movies and music on. You can play a DVD on a computer or a special machine (called a DVD player ) Is the movie available on DVD ?

dwarf / dworf / noun [ count ]

(in children's stories) a very small person Snow White and the Seven Dwarfs

( biology ) a person, animal, or plant that is much smaller than the usual size

dye / dai / verb ( dyes , dye ing , dyed )

to change the color of something by using a special liquid or substance

She dyed her hair blond.

dye noun [ count, noncount ]

a substance that you use to change the color of something, for example cloth or hair purple hair dye

dy • ing

form of die 1

dy • nam • ic AWL / dai 'nremik / adjective

full of energy and ideas a dynamic teacher

dy • na • mite / ' daimmait / noun [noncount]

a powerful substance that can explode a stick of dynamite

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