Английский словарь американских идиом - lose track

{v. phr.} To forget about something; not stay informed; fail to keep a count or record. * /What's the score now? I've lost track./ - Usually used with "of". * /Mary lost track of her friends at camp after summer was over./ * /John lost track of the money he spent at the circus./ Compare: OUT OF TOUCH. Contrast: KEEP TRACK.