Fetching details from the dictionary...

to tell (to do); to order; to direct; to instruct
to tell (on someone); to report; to snitch
to often say; to be used to saying
母に言い付けて弟を叱ってもらった。
I told on my brother to mom and had him scolded.
先生に言い付けられた仕事を終えた。
I finished the work the teacher assigned me.
悪いことをしたら親に言い付けるよ。
If you do something bad, I'll tell your parents.