Definitions of sweat:

• noun:   condensation of moisture on a cold surface

  Example: "The cold glasses were streaked with sweat"

• noun:   salty fluid secreted by sweat glands

  Example: "Sweat poured off his brow"

• noun:   agitation resulting from active worry

  Example: "He's in a sweat about exams"

• noun:   use of physical or mental energy; hard work
• verb:   excrete perspiration through the pores in the skin

  Example: "Exercise makes one sweat"

• name:  A surname (rare: 1 in 25000 families; popularity rank in the U.S.: #3137)