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To fall asleep, usually briefly or when one does not intend to. I was so tired from staying up all night that I kept nodding off throughout the day.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
to fall asleep, usually while sitting up. Jack nodded off during the minister's sermon. Father always nods off after Sunday lunch.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Fall asleep momentarily, doze, as in Grandma spends a lot of time in her rocking chair, nodding off now and then. This expression alludes to the quick involuntary dropping of one's head from an upright position when drowsy or napping. The verb nod alone was so used from the mid-1500s. Also see drop off, def. 1.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
To fall asleep, especially without intending to do so: Some of the students nodded off during the lecture.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.