Question

While having a serious conversation about your relationship, your romantic partner stops midsentence and exclaims, "we are out of milk." your partner's comment is an example of?

Answer 1

Answer: Idiomatic expression

An idiomatic expression is an Informal English word whose meaning is different.

Like in the example "we are out of milk." Literally, it means that there is no more milk. If it is taken as an idiomatic expression, it would be taken differently, depending on the culture or the situation.