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flirt

/flɜːt/ noun

Origin

1553, from the merger of Early Modern English flirt (“to flick”), flurt (“to mock, jibe, scorn”), and flirt, flurt (“a giddy girl”). Of obscure origin and relation. Apparently related to similar words in Germanic, all of apparently onomatopoeic origin, compare Low German flirt (“a flick of the fingers, a light blow”), Low German flirtje (“a giddy girl”), Low German flirtje (“a flirt”), German Flittchen (“a flirt; tart; hussy”), Norwegian flira (“to giggle, titter”).

From Wiktionary, via Kaikki.org (CC BY-SA)