expletive
noun /ɪkˈspliːtɪv/
/ˈeksplətɪv/
(formal)- a word, especially a rude word, that you use when you are angry, or in pain
（愤怒或痛苦时用的）秽语，咒骂语，感叹语 - He dropped the book on his foot and muttered several expletives under his breath.
他把书放在脚上，低声咒骂了几句。 - ‘Why don't you just [expletive deleted] (= used when you edit out a rude word when reporting what somebody has said)?’
“你为什么不直接[咒骂语删除]？
词源late Middle English (as an adjective): from late Latin expletivus, from explere ‘fill out’, from ex- ‘out’ + plere ‘fill’. The noun sense ‘word used merely to fill out a sentence’ (early 17th cent.) was applied specifically to a swear word in the early 19th cent. - He dropped the book on his foot and muttered several expletives under his breath.