Noun A garment for the upper part of the body, typically having a collar, sleeves, and a front opening, 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, a member of the shirt-wearing team, verb_ To cover or clothe with a shirt, or as if with a shirt, put a shirt on, To cover or clothe with a shirt, or as with a shirt