Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Origin: From the sound

rat-a-tat

 noun
     
NEW! See related topics: COLOURS AND SOUNDS
rat-a-tat also rat-a-tat-tat [singular]
C the sound of knocking, especially on a door
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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