sweat

For the verb: "to sweat"

Simple Past:	sweat, sweated
Past Participle:	sweat, sweated

Concise Oxford English Dictionary © 2008 Oxford University Press:
sweat/swet/

▶noun

• 1 moisture exuded through the pores of the skin, especially as a reaction to heat, physical exertion, or anxiety.

• 2 informal hard work; laborious effort.

  ■ a state of anxiety or distress.

• 3 (sweats) informal, chiefly N. Amer. a sweatsuit or sweatpants.

▶verb (sweats, sweating; past and past part. sweated or N. Amer. sweat)

• 1 exude sweat.

  ■ (sweat something out/off) get rid of something by exuding sweat.

• 2 exert a great deal of strenuous effort.

  ■ be in a state of extreme anxiety.

  ■ N. Amer. informal worry about.

• 3 (of a substance) exude moisture.

• 4 cook (chopped vegetables) slowly in a pan with a small amount of fat.

• 5 subject (metal) to surface melting, especially to fasten or join by solder without a soldering iron.

– phrases
break sweat (or N. Amer. break a sweat) informal exert oneself physically.
by the sweat of one's brow by one's own hard labour.
no sweat informal used to convey that one perceives no difficulty or problem with something.
sweat blood informal make an extraordinarily strenuous effort.

■ be extremely anxious.

sweat bullets N. Amer. informal be extremely anxious or nervous.
sweat it out informal endure prolonged heat, exertion, or anxiety.

– origin OE swāt (n.), swǣtan (v.), of Gmc origin.