cluck (v.) Look up cluck at Dictionary.com
Old English cloccian originally echoic. Compare Turkish culuk, one of the words for "turkey;" Greek klozein, Latin glocire, German glucken. Related: Clucked; clucking.
cluck (n.) Look up cluck at Dictionary.com
1703, "sound made by a hen," from cluck (v.). Slang meaning "stupid person" (turkeys are famously foolish) is from 1927.