A male goose; or an old-fashioned slang term for a quick look at something.
From Old English 'gandra' or 'gant,' from Proto-Germanic 'gandroz.' The term for male goose has been in English since before 1000 CE. The slang meaning 'a look' emerged in the 19th century, possibly from the stretching motion geese make.
The slang 'take a gander' (meaning take a quick look) probably comes from how geese stick their long necks out curiously—so you're basically stretching like a goose to peek at something!
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