absol. or intransitive. To utter curses; to swear profanely in anger or irritation.

transitive. To declare or promise (something) on oath, to swear solemnly. Chiefly with that, or with clause as object. Also occasionally intransitive…

intransitive. To utter a form of oath lightly or irreverently, as a mere intensive, or an expression of anger, vexation, or other strong feeling…

to swear like a lord: to swear or curse violently, frequently, or without restraint. Now rare.

intransitive. To act or speak profanely; to blaspheme, swear. rare after 17th cent.

intransitive. To utter the imprecation ‘sink!’; (hence more generally) to use profane language; to swear, curse. Now Scottish (Shetland).

intransitive. colloquial and regional. To use strong language; to swear, curse. Frequently to rip and swear.

intransitive. To curse or swear; to use obscene or profane language. Also in extended use. Cf. curse, v. 4.

To strike out with (the fist, the heels, etc.). Chiefly absol. or intransitive. To strike or lash out. Hence, to give way to invective, use…

transitive. To exclaim as an expletive or with expletives. Also intransitive.

intransitive. British colloquial. To utter the word ‘fuck’; to swear, use profanities. Originally and chiefly in to eff and blind: to use strong…

intransitive. To curse or swear; to use coarse or obscene language. Also: to make insulting, disparaging, or slanderous remarks (often with against).