Where does “soft-on” come from?

soft-on (English) comes from English soft, from Middle English softe, from Old English sōfte, from Proto-West Germanic samftō, from Proto-West Germanic -ō, from Proto-Germanic -ô, from Proto-Indo-European -ō — Derives nouns from roots.

soft-on (English): The state of the penis being only partially erect

Definitions

  1. The state of the penis being only partially erect

Ancestry of “soft-on”, step by step

soft-on traces back through two separate lines of ancestry.

via English soft

StepLanguageWordMeaning
1EnglishsoftEasily giving way under pressure; Smooth and...
2Middle Englishsoftesoft
3Old Englishsōftesoftly
4Proto-West Germanicsamftōsoftly, gently
5Proto-West GermanicCreates adverbs from adjectives; Creates agent...
6Proto-Germanic-ly; Forms agent nouns, often from the zero-grade...
7Proto-Indo-EuropeanDerives nouns from roots

via English hard-on

StepLanguageWordMeaning
1Englishhard-onAn erection of the penis
Every word from Proto-Indo-European