"You canker blossom!" 3 Shakespearean Insults
late 16c., "to mark with a buoy," from buoy (n.). Meaning "rise up, lift, sustain" is from c.1600, perhaps influenced by Spanish boyar "to float," ultimately from the same source. In the figurative sense (of hopes, spirits, etc.) it is recorded from 1640s. Related: Buoyed; buoying.