retiring (adj.)

1530s, of armies, "to retreat, draw back," also, of persons, "to withdraw" to some place, especially for the sake of privacy; from French retirer "to withdraw (something)," from re- "back" (see re-) + Old French tirer "to draw" (see tirade). Related: Retired; retiring.

The sense of "leave one's business or occupation" is by 1660s. The meaning "to leave company and go to bed" is from 1660s. Transitive sense is from 1540s, originally "withdraw, lead back" (troops, etc.); meaning "to remove from active service" is from 1680s. Baseball sense of "to put out" (a batter or team) is recorded by 1874.