Definition of shut off phrasal verb from the Oxford Advanced Learner's Dictionary

 

shut off

 phrasal verb
phrasal verb How machines work
 
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Phrasal Verbs
(of a machine, tool, etc.) to stop working The engines shut off automatically in an emergency. See related entries: How machines work
  1. 1to stop a machine, tool, etc. from working I wish someone would shut off that car alarm. See related entries: How machines work
  2. 2to stop a supply of gas, water, etc. from flowing or reaching a place A valve immediately shuts off the gas when the lid is closed.
See the Oxford Advanced American Dictionary entry: shut off

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