shrink

For the verb: "to shrink"

Simple Past:	shrank, shrunk
Past Participle:	shrunk

Concise Oxford English Dictionary © 2008 Oxford University Press:
shrink/ʃrɪŋk/

▶verb (past shrank; past part. shrunk or (especially as adj.) shrunken)

• 1 become or make smaller in size or amount; contract.

  ■ (of clothes or material) become smaller as a result of being immersed in water.

• 2 move back or away in fear or disgust.

  ■ (shrink from) be unwilling to do (something).

▶noun informal a psychiatrist.

– derivatives
shrinkable adjective,
shrinker noun.

– origin OE scrincan, of Gmc origin; the noun is from headshrinker.