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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Unknown, perhaps dialectal. It seems to have originally referred to a lucky shot at billiards. Possibly connected to sense 3, referring to whales' use of flukes to move rapidly. Possibly derived from German Glück (“luck, good fortune, happiness”).
good luck, good fortune
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tap / space
Classic usage
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