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The Collaborative International Dictionary
Bumbailiff

Bumbailiff \Bum"bail"iff\, n. [A corruption of bound bailiff.] See Bound bailiff, under Bound, a.

Douglas Harper's Etymology Dictionary
bumbailiff

server of writs, maker of arrests, etc., c.1600, from bum "arse" (see bum (n.1)), because he was always felt to be close behind, + bailiff.

Wiktionary
bumbailiff

n. (context UK obsolete English) A bound bailiff.