From wikipedia:
In linguistics, trope is a rhetorical figure of speech that consists of a play on words, i.e., using a word in a way other than what is considered its literal or normal form. The other major category of figures of speech is the scheme, which involves changing the pattern of words in a sentence.Here's an interesting site which you can find tropes related to ANY movies, tv series or animation which had ever been produced.
Link : http://tvtropes.org