snap on/off phrasal verb (
see also snap)
to switch something on or off, or to switch on or off:
A light snapped on in one of the huts.snap something ↔ on/off Kathy snapped off the light. [TahlilGaran] Dictionary of Contemporary English ▲
ˈsnap-on adjective [only before noun] a snap-on part of something can be fastened on and removed easily
[TahlilGaran] Dictionary of Contemporary English ▲