be on at

be on at

1. To be televised at a particular time (which follows "at"). The movie is on at 8, so I'm going to start making the popcorn now.

2. To nag someone about something. In this usage, "at" is followed by a noun or pronoun. Ugh, my mom is on at me all the time about my grades, but I just have no interest in the classes I'm taking this semester.

See also: on

be on at someone

nag or grumble at someone. British informal

See also: on, someone

be/go/keep ˈon at somebody (to do something)

(informal, disapproving) keep criticizing somebody or telling them what to do, etc: He keeps on at her all the time about her smoking.

See also: go, keep, on, somebody