"make a quick, sharp noise," 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.
1650s, "a crackling noise," noun of action from Latin crepitare "to crackle," frequentative of crepare "to crack, creak" (see raven). In medical use from 1834 in reference to the crackling sound in the lungs characteristic of pneumonia. Related: Crepitate (1620s); crepitant.
1590s, "to laugh loudly," frequentative of Middle English chukken "make a clucking noise" (late 14c.), of imitative origin. Meaning shifted to "laugh in a suppressed or covert way, express inward satisfaction by subdued laughter" by 1803. Related: Chuckled; chuckling.
"small puddle, shallow pool, wet ground," Old English plæsc "pool of water, puddle," probably imitative (compare plash (v.1) and Dutch plass "pool"). Meaning "noise made by splashing" is recorded by 1510s. Related: Plashy.