September is Etymology Month (14)

warble c.1300, from O.N.Fr. werbler "to sing with trills and quavers," from Frank. *werbilon (cf. O.H.G. wirbil "whirlwind," Ger. Wirbel "whirl, whirlpool, tuning peg, vertebra," M.Du. wervelen "to turn, whirl"). The noun meaning "tune, melody" is recorded from c.1300.