I tell you when to start,
Or remind if you forget.
I smash others to break them apart,
But I’m pushed by another of me.
What am I?
Cue. A cue tells you when to start, or if you forget your lines in a play. A cue ball is used to break at the beginning of a game of pool and the cue stick is used to push the cue ball on the break.
Another interesting tidbit is that cue is how you spell the letter q if you’re writing it out.