1610s, "to dip water out of," from baile
(n.) "small bucket" (early 14c.), from O.Fr. baille
"bucket, pail," from M.L. *bajula (aquae)
, lit. "porter of water," from L. bajulare
"to bear a burden" (see bail
(n.1)). To bail out
"leave suddenly" (intrans.) is recorded from 1930, originally of airplane pilots. As a noun, sometimes bailout
, it dates from 1955.