Etymology
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geezer (n.)

derisive word for an old man, 1885, according to OED a variant of obsolete Cockney guiser "mummer, one wearing a mask or costume as part of a performance" (late 15c.; see guise). If so, the original notion was "one who went about in disguise," hence "odd man," hence "old man" (it still commonly is qualified by old).

updated on March 31, 2020

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Definitions of geezer from WordNet

geezer (n.)
a man who is (usually) old and/or eccentric;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.