Green’s Dictionary of Slang

(W.I./UK teen) to shirk work, to behave lazily; to relax.

1983		T. White Catch a Fire 123: A place to have sex and sometimes even ‘cotch’ (sleep) for the evening.
1995		Francis-Jackson Official Dancehall Dict. 29: Kotch 1. (derog.) to hang around, though unwelcome. 2. to perch oneself in/On a small space: u. me can kotch ya; 3. to hold open a door with a heavy object etc.: u. kotch de door deh fi me.
2003		BlazinParadise ‘Blazing Squad Language’ 🌐 Kotchin – Chilin’ out.
2004		Skinnyman ‘Council Estate of Mind’ 🎵 Kids have got a place [...] to cotch and blaze pot.
2016		Skepta ‘Ladies Hit Squad’ 🎵 After we done, bill a spliff and cotch / Pour me a glass of the Henny on the rocks.
2017		theculturetrip.com ‘Guide to London Slang 10 Jan. 🌐 Kotch – sit and chill the hell out, as in ‘Luke needs to kotch the hell out’.
2020		G. Krauze What They Was 13: We [...] go and cotch in Bimz’s yard.