Meaning of the word "lose track of" in English

What does "lose track of" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

lose track of

US /luːz træk əv/
UK /luːz træk əv/

Idiom

to no longer know where someone or something is or what is happening

Example:
I lost track of time while reading that book.
We lost track of each other after college.