Definition of down adverb from the Oxford Advanced Learner's Dictionary

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down

adverb
daʊn
 
; daʊn
 
 
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For the special uses of down in phrasal verbs, look at the entries for the verbs. For example climb down is in the phrasal verb section at climb.
1 to or at a lower place or positionShe jumped down off the chair.He looked down at her.We watched as the sun went down.She bent down to pick up her glove.Mary's not down yet (= she is still upstairs).The baby can't keep any food down (= in her body).2 from a standing or vertical position to a sitting or horizontal onePlease sit down.He had to go and lie down for a while.3 at a lower level or ratePrices have gone down recently.We're already two goals down (= the other team has two goals more).4 used to show that the amount or strength of something is lower, or that there is less activityTurn the music down!The class settled down and she began the lesson.5 (in a crossword) reading from top to bottom, not from side to sideI can't do 3 down.6 to or in the south of a countryThey flew down to Texas.Houses are more expensive down south.7 on paper; on a listDid you get that down?I always write everything down.Have you got me down for the trip?8 used to show the limits in a range or an orderEveryone will be there, from the Principal down.9 having lost the amount of money mentionedAt the end of the day we were £20 down.10 if you pay an amount of money down, you pay that to start with, and the rest later11 (informal) used to say how far you have got in a list of things you have to doWell, I've seen six apartments so far. That's six down and four to go!12 (informal) to or at a local place such as a shop/store, pub, etcI'm just going down to the post office.I saw him down at the shops.
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In informal British English, to and at are often left out after down in this sense:
 
;
 
He's gone down the shops.
Idioms

be down to somebody

(informal) to be the responsibility of somebodyIt's down to you to check the door.

be down to somebody/something

to be caused by a particular person or thing
She claimed her problems were down to the media.

be down to something

to have only a little money left
I'm down to my last dollar.

be/go down with something

to have or catch an illness

down through something

(formal) during a long period of timeDown through the years this town has seen many changes.

down to the last, smallest, final, etc. something

including every small part or detail of something
She organized everything down to the last detail.

down under

(informal) to or in Australia and/or New Zealand

down with somebody/something

used to say that you are opposed to something, or to a person
The crowds chanted ‘Down with NATO!’
more at you can't keep a good man down at man n.Usage noteUsage note: fallDescribing a decreaseCar crime in Oxford fell significantly last year.Car crime fell by about a quarter over a 12-month period.The number of stolen vehicles dropped from 1013 to 780, a fall of 26 per cent.According to this data, 780 vehicles were stolen, 26% down on the previous year.There was an 11% drop in reported thefts from motor vehicles, from 1871 to 1737.These figures show that, as far as car crime is concerned, the main trend is downwards. Language Banks at expect, illustrate, increase, proportion