expletives Definition

a syllable, word, or phrase inserted to fill a vacancy (as in a sentence or a metrical line) without adding to the sense; especially : a word (such as it in "make it clear which you prefer") that occupies the position of the subject or object of a verb in normal English word order and anticipates a subsequent word or phrase that supplies the needed meaningful content

an exclamatory word or phrase; especially : one that is obscene or profane

one that serves to fill out or as a filling