Where does “slacke” come from?

slacke (Middle Dutch) comes from Middle Dutch slecke, from Old Dutch slekki, from Proto-Germanic slikkō.

Ancestry of “slacke”, step by step

StepLanguageWordMeaning
1Middle Dutchsleckesnail
2Old Dutchslekki—
3Proto-Germanicslikkō—
Every word from Proto-Germanic slikkō →Every word from Old Dutch slekki →Every word from Middle Dutch slecke →
slacke — Etymology, Origin & Word History | Etymology Explorer