​[intransitive] to decrease in amount, volume, strength, etc. The pound has sunk to its lowest recorded level against the dollar. He is clearly sinking fast (= ...

a large open container in a kitchen that has taps to supply water and that you use for washing dishes in

(of a person) to move downward, especially by falling or sitting down synonym collapse I sank into an armchair. She sank back into her seat, exhausted. The old ...

a large open container in a kitchen or bathroom that has faucets to supply water and that you use for washing dishes in, or for washing your face and hands in.

to become submerged in water; to go under or to the bottom of the sea, a lake, etc.; (of a ship) to founder. Also in figurative context.

sink adjective /sɪŋk/ /sɪŋk/ [only before noun] (British English) located in a poor area where social conditions are bad.

​(of words, an event, etc.) to be fully understood or realized. He paused to allow his words to sink in. The full scale of the disaster has yet to sink in.

There are 32 meanings listed in OED's entry for the noun sink, 12 of which are labelled obsolete. See 'Meaning & use' for definitions, usage, and quotation ...

sink in | sink into something (of words, an event, etc.) to be fully understood or realized He paused to allow his words to sink in.

to go gradually into a less active, happy, or pleasant state. She sank into a deep sleep. He sank deeper into depression.