English
kiss-in
From kiss + -in, modelled on sit-in, etc.
Formed from kiss + -in
Proto-Indo-European *kw(e)s- ‘to kiss’
…
Proto-Germanic *kussijaną ‘to kiss’
Proto-West Germanic *kussijan ‘to kiss’
Old English cyssan ‘to kiss’
Middle English kissen ‘to kiss’
English kiss
Today it means
noun A peaceful form of protest in which people kiss in a public place; especially, a protest with same-gender kissing by LGBTQ people to demonstrate their sexual orientation, protest homophobia, etc.
Language periods are conventional ranges, not dates for this word.
Etymograph / kiss-in