sink unit

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Also see: unit

Concise Oxford English Dictionary © 2008 Oxford University Press:
sink1

▶verb (past sank; past part. sunk)

• 1 go down below the surface of liquid; become submerged.

  ■ (with reference to a ship) go or cause to go to the bottom of the sea.

• 2 fail and not be seen or heard of again.

  ■ cause to fail.

  ■ conceal or ignore: they agreed to sink their differences.

• 3 drop downwards.

  ■ lower oneself or drop down gently.

  ■ gradually decrease or decline in amount or intensity.

  ■ lapse or fall into a particular state or condition.

• 4 (sink in) (of words or facts) become fully understood.

• 5 pocket (a ball) in snooker or billiards.

  ■ Golf hit the ball into the hole with (a putt or other shot).

• 6 insert beneath a surface.

  ■ (sink something into) cause something sharp to penetrate (a surface).

  ■ excavate (a well) or bore (a shaft) vertically downwards.

• 7 (sink something in/into) put money or energy into.

• 8 Brit. informal rapidly consume (an alcoholic drink).

– phrases
a (or that) sinking feeling an unpleasant bodily sensation caused by apprehension or dismay.
sink or swim fail or succeed by one's own efforts.

– derivatives
sinkable adjective,
sinkage noun.

– origin OE sincan, of Gmc origin.

Concise Oxford English Dictionary © 2008 Oxford University Press:
sink2

▶noun

• 1 a fixed basin with a water supply and outflow pipe.

• 2 a pool or marsh in which a river's water disappears by evaporation or percolation.

  ■ technical a body or process which absorbs or removes energy or a particular component from a system.

  The opposite of source.

• 3 short for sinkhole.

• 4 [as modifier] Brit. denoting a school or housing estate situated in a socially deprived area.

– origin ME: from sink1.