English
locksman
From lock + -s- + -man.
Formed from lock + -s- + -man
Proto-Indo-European *lewg- ‘to bend’
Proto-Germanic *luką
Proto-West Germanic *lok ‘shutter’
Old English loc
Middle English lok
English lock
Today it means
noun A man who operates a lock on a river or canal.
Language periods are conventional ranges, not dates for this word.
Etymograph / locksman