来源于法语中的par cause或英语中的by cause;最初在句子中后跟介词of或由that(或why)引导的从句;到14世纪末，that(或why)即已开始被忽略。
late 14c., from phrase bi cause, introducing a subordinate clause or phrase, "by cause, for the reason that," from by (prep.) + cause (n.). Modeled on French par cause. Originally often followed by that or why. As an adverb, "by reason, on account" (with of), from late 14c. Clipped form cause (sometimes 'cause) is attested in writing by mid-15c.