shirt

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A garment for the upper part of the body, typically having a collar, sleeves, and a front opening.
• noun An undershirt.
• noun A nightshirt.
• idiom (keep (one's) shirt on) To remain calm or patient.
• idiom (lose (one's) shirt) To lose everything one has or owns.
• idiom (the shirt off (one's) back) The maximum one is able to give or lose.

from The Century Dictionary.

• noun A garment, formerly the chief under-garment of both sexes.
• noun The amnion, or some part of it.
• noun In a blast-furnace, an interior lining.
• To clothe with a shirt; hence, by extension, to clothe; cover.

from the GNU version of the Collaborative International Dictionary of English.

• verb To cover or clothe with a shirt, or as with a shirt.
• noun A loose under-garment for the upper part of the body, made of cotton, linen, or other material; -- formerly used of the under-garment of either sex, now commonly restricted to that worn by men and boys.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An article of clothing that is worn on the upper part of the body, and often has sleeves, either long or short, that cover the arms.
• noun a member of the shirt-wearing team.
• verb To cover or clothe with a shirt, or as if with a shirt.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a garment worn on the upper half of the body
• verb put a shirt on