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Merriam-Webster’s Collegiate Dictionary, Tenth Edition is unavailable, but you can change that!

Merriam-Webster’s Collegiate Dictionary is based on the world’s largest collection of information about the way the English language is written and spoken in our time—a citation file of over 14½ million examples of English words drawn from actual use, more than 1 million collected since the last edition. The volume also includes: well-drafted Definitions and Pronunciations, Extensive...

shut off (1824) transitive verb 1 a : to cut off (as flow or passage) : STOP 〈shuts off the oxygen supply〉 b : to stop the operation of (as a machine) 〈shut the motor off〉 2 : to close off : SEPARATE — usually used with from 〈shut off from the rest of the world〉 intransitive verb : to cease operating : STOP 〈shuts off automatically〉