1
Stage 1 of 3
mugga
Old Norse · medieval
"drizzling mist"
described a drizzling, misty fog
2
Stage 2 of 3
mugen
Middle English · c. 1390
"of fog: to drizzle"
verb borrowed from the Norse noun, meaning to drizzle
3
Stage 3 of 3
muggy
English · 1746
"damp, close, warm and humid"
-y suffix added to obsolete noun 'mug' (fog), sense shifted from mist itself to the sticky weather it brings
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