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Idioms for off

Origin of off

orig. stressed variant of of1

usage note for off

The phrasal preposition off of is old in English, going back to the 16th century. Although usage guides reject it as redundant, recommending off without of, the phrase is widespread in speech, including that of the educated: Let's watch as the presidential candidates come off of the rostrum and down into the audience. Off of is rare in edited writing except to give the flavor of speech.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for on-off

British Dictionary definitions for on-off (1 of 2)

on-off

adjective

(of an electrical switch, button, etc) having an `on' position and an `off' position
existing at times and not at others; discontinuousan on-off relationship

British Dictionary definitions for on-off (2 of 2)

Word Origin for off

originally variant of of; fully distinguished from it in the 17th century

usage for off

In standard English, off is not followed by of: he stepped off (not off of) the platform
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Idioms and Phrases with on-off

off

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.