Meaning of “sink” - Learner’s Dictionary

sink

verb us uk /sɪŋk/ past tense and past participle sank, also US sunk, past participle sunk
Extra Examples
The boat sank in rough seas off the Swedish coast.The weight of the load caused the boat to sink.Investigators still dont know what caused the ship to sink.The ship sank on its maiden voyage.The captain reported that his ship was sinking.
WATER [ I, T ]

B1 to go down or make something go down below the surface of water and not come back up:

The Titanic sank after hitting an iceberg.
During the first wave of attacks, they sank three enemy ships.
SOFT SUBSTANCE [ I, T ]

B1 to go down, or make something go down, into something soft:

My feet keep sinking into the sand.
It sank its teeth into his arm.
MOVE DOWN [ I ]

B2 to move down slowly:

The sun sank below the horizon.

(Definition of “sink verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)