Krzesimir Bis
Krzesimir Bis voted up Jaimie JT's answer

it a means a plot twist ...or highly dramatic event ..  I can't think of a better way to explain it. It means that though cos  I said so.

Krzesimir Bis
Krzesimir Bis voted up Didge Doo's answer

Your teacher was just trying to make it interesting for you. It translates as "an event" or "a twist or turn". Just find some highlights, preferably with a surprise twist, and you'll be fine.