What does "sink" mean?

In addition to the idioms beginning with sink, also see desert a sinking ship; enough to sink a ship; everything but the kitchen sink; heart sinks.

See sink in WNW Idioms

sink in

Informal to be grasped by the mind, esp. with difficulty; be recognized or understood in full

See sink in American Heritage Dictionary 4 Idioms

sink or swim

Informal
To fail or succeed without alternative.

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