trope

noun
1
a word or phrase that is used in a way that is different from its usual meaning in order to create a particular mental image or effect. Metaphors and similes are tropes.
تمثیل, تشبیه, استعاره, مجاز
2
a theme that is important or repeated in literature, films, etc.
تم, مضمون, درونمایه
the trope of the mad scientist in horror movies