The story
- Middle English · inherited fromcloteren“to form clots; coagulate; heap on”
- English todayclutter
From Middle English cloteren (“to form clots; coagulate; heap on”), from clot (“clot”), equivalent to clot + -er (frequentative suffix). Compare Welsh cludair (“heap, pile”), cludeirio (“to heap”).
Etymology from Wiktionary, CC BY-SA 4.0.