Other forms: expletives
An expletive is a rude word blurted out in anger or pain. The thing you say when the hammer misses.
It is the formal term, which is why court reports and broadcast notices use it, and the phrase expletive deleted became famous from the Watergate transcripts. Linguistics has a completely separate technical sense, since an expletive is also a word filling a grammatical slot without meaning, like the it in it is raining. Swear word is the plain everyday term.
1nounexpletiveA swear word, especially one uttered in anger or pain.
“He dropped the tray and let out an expletive.”
Also accepted in games: swear word, curse
An expletive is a filler. Latin explētīvus meant serving to fill out, from expleō, to fill, so the word names the padding and not the rudeness.
Latin
explētīvus — serving to fill out
English, today
expletive
Built from
From Latin explētīvus (“serving to fill out”), from Latin explētus, the perfect passive participle of expleō (“fill out”), itself from ex (“out, completely”) + *pleō (“fill”).
Etymology from Wiktionary, CC BY-SA