porkpie hat definition, porkpie hat meaning | English dictionary

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porkpie hat


      n   a hat with a round flat crown and a brim that can be turned up or down  
English Collins Dictionary - English Definition & Thesaurus  
See also:

pork pie, pokie, pork pig, pork

Collaborative Dictionary     English Definition
without any hesitation, delay or preparation ; instantly ; at the slightest signal/urging/pretext/provocation
Note: Probably alludes to the late 19th century common practice of signaling the start of a race or other contest by either dropping a hat or sweeping it in a rapid downward motion. Ex.: Call Mike if you need help; he can come at the drop of a hat / He was known for his generosity and kindness but when things were going wrong at work, he could turn nasty at the drop of a hat
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