lose count of

lose count (of something)

To fail to remember or keep an accurate tally of how many of something there is, often due to there being a great amount. At this point, I've lost count of the number of times they've yelled at me! Ah, shoot—I lost count! I'll have to start the whole inventory over again now.
See also: count, lose
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

lose count of someone or something

to fail to be able to count someone or something, especially because there are so many. I have lost count of the people who have asked that question. I am afraid I have lost count of all the times we have run out of money.
See also: count, lose, of
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
See also:
References in classic literature ?
Living down in the country you lose count of time, and I forgot that it was July, when people go out of the city.
I take the ScotRail cattle truck to Glasgow every day and when I look out over the nearby M8, I lose count of the number of cars which only have one person in them.
TREVOR Hemmings - boss of Arena Leisure and owner of Blackpool Tower - must be beginning to lose count of the horses he has in training.