Bailly
κρού·πεζαι, ῶν (αἱ) c. κρούπαλα PAUS. (EUST.
867, 29).
Étym. κρούω, πέζα.
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LSJ
αἱ, high wooden shoes, used in Boeotia for treading olives, and worn on the stage by flute-players to beat time, Paus.Gr. Fr. 239, Poll. 7.87 (sg.), Phot. ; — also κρούπαλα, τά, S. Fr. 44; κρούπετα, Hsch.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)