c.1400, "a blow, stroke," perhaps originally imitative of the sound of patting. Meaning "light tap with hand" is from c.1804. Sense of "that which is formed by patting" (as in pat of butter) is 1754, probably from the verb. Pat on the back in the figurative sense attested by 1804.
pat
adv.
"aptly, suitably, at the right time," 1570s, perhaps from pat (adj.) in sense of "that which hits the mark," a special use from pat (n.) in sense of "a hitting" of the mark. The modern adjective is 1630s, from the adverb.
pat
v.
1560s, "to hit, throw;" meaning "to tap or strike lightly" is from 1714; from pat (n.). Related: Patted; patting. The nursery rhyme phrase pat-a-cake is known from 1823. Alternative patty-cake (usually American English) is attested from 1794 (in "Mother Goose's Melody, or Sonnets for the Cradle," Worcester, Mass.).
Pat
as a fem. proper name, short for Patricia. As a masc. proper name, short for Patrick; hence a nickname for any Irishman.
Refuse to change one's position or opinion, as in We're going to stand pat on this amendment to the bylaws. This expression may be derived from the verb pat in the sense of “strike firmly and accurately.” [Late 1800s]
