‘zip-lipped’: meanings and origin

having the lips tightly closed—hence, figuratively: uncommunicative, determinedly reticent—USA, 1942—refers to the noun ‘zip’, designating a fastening device

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‘hair-triggered’: meanings and origin

literally (UK, 1803): of a firearm: equipped with a hair trigger—hence, figuratively (Ireland, 1853): reacting immediately to the slightest provocation or cause

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