clack (v.)youdaoicibaDictYouDict[clack 词源字典]
mid-13c., not in Old English, from Old Norse klaka "to chatter," of echoic origin; compare Dutch klakken "to clack, crack," Old High German kleken, French claquer "to clap, crack (see claque). Related: Clacked; clacking.[clack etymology, clack origin, 英语词源]
clack (n.)youdaoicibaDictYouDict
mid-15c., from clack (v.).