From Longman Dictionary of Contemporary Englishlose countlose countCOUNT/CALCULATEto forget a number you were calculating or a total you were trying to countlose count of There have been so many accidents here, the police have lost count of them. → count
Examples from the Corpus
count of• I lose count of the fatalities.• He had little idea as to how far they had come and had lost count of how many times they had fallen.• Francis had lost count of the junctions and side-passages they had crossed.• She had lost count of the number of times she had slapped his hands from her body whenever he waylaid her outside.• I have lost count of the number of friends I have lost to this disease.• I, too, have lost count of the number of jobs I've applied for.• I've no idea, I lost count of time.• I've lost count of the number of weddings happening this year - hence the need to do some dressmaking. 