Meaning of “down” - Learner’s Dictionary

down

adverb, preposition uk us /daʊn/
LOWER PLACE

A2 towards or in a lower place:

The kids ran down the hill to the gate.
She tripped and fell down.
I bent down to have a look.
LEVEL/AMOUNT

towards or at a lower level or amount:

Can you turn the music down?
Slow down so they can see us.
SURFACE

A1 moving from above and onto a surface:

I sat down and turned on the TV.
Put that box down on the floor.
DIRECTION

in or towards a particular direction, usually south:

Pete's moved down to London.
down the road/river, etc

A2 along or further along the road/river, etc:

There's another pub further down the street.
note/write, etc sth down

B1 to write something on a piece of paper:

Can I just take down your phone number?
STOMACH

inside your stomach:

He's had food poisoning and can't keep anything down.
be down to sb UK

to be someone's responsibility or decision:

I've done all I can now, the rest is down to you.
come/go down with sth

to become sick:

The whole family came down with food poisoning.

(Definition of “down adverb, preposition” from the Cambridge Learner’s Dictionary © Cambridge University Press)