Popular fast dance to swing music in the 1940s (9)

I believe the answer is:

jitterbug

(Other definitions for jitterbug that I've seen before include "1940s US dance" , "Nervous person" , "Fast, jerky American dance of the 1940s" , "Lively jazz dance of the 1940s" .)

I've seen this clue in The Guardian.

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