/ˈsaɪdtræk/
side·track
BrE /ˈsaɪdtræk/
NAmE /ˈsaɪdtræk/
[usually passive]
~ sb (into doing sth)
to make sb start to talk about or do sth that is different from the main thing that they are supposed to be talking about or doing
SYN distract
I was supposed to be writing a letter but I’m afraid I got sidetracked.