Geezer definitions

gē'zər
An old person, especially an eccentric old man.
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An old person, esp. an old man.
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(informal, chiefly UK, dated in US) A male person.
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(UK, slang) Informal address to a male.

Hi geezer, you alright?

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(informal, chiefly US, sometimes mildly derogatory) An old person, usually a male, typically a cranky old man.
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(UK) A device for boiling water for such domestic uses as heating or washing; a boiler. The normal spelling is water geyser.
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Origin of geezer

Probably alteration of dialectal guiser mummer, masquerader, person who looks odd or acts strangely from Middle English gysar from gysen to dress from gyse, guise fashion guise