From Longman Dictionary of Contemporary Englishswitch off phrasal verb1 SWITCH ON OR OFFto turn off a machine, light, radio etc using a switchswitch something ↔ off The burglar alarm was switched off. Don’t forget to switch off before you go.2 informalATTENTION# to stop listening to someone He just switches off and ignores me.3 to relax for a short time Switch off by listening to music. → switch→ See Verb table
Examples from the Corpus
switch off• In the end I got sick of the conversation and switched off.• It's OK - I switched the TV off before I went out.• It's difficult for teachers to switch off when they go home at night.• Always switch off your computer when you've finished. 