a person or thing that ruins or spoils: Gambling was the bane of his existence.
2.
a deadly poison (often used in combination, as in the names of poisonous plants): wolfsbane; henbane.
3.
death; destruction; ruin.
4.
Obsolete. that which causes death or destroys life: entrapped and drowned beneath the watery bane.
Origin: before 1000; Middle English; Old English bana slayer; cognate with Old Norse bani death, murderer, Old Frisian bona murder, Old Saxon bano murderer, Old High German bano slayer, bana death; akin to Old English benn,Gothic banja wound
O.E. bana "killer, slayer, murderer," from P.Gmc. *banon, cognate with *banja- "wound" (cf. O.Fris. bona "murderer," O.H.G. bana "murder," O.E. benn "wound," Goth. banja "stroke, wound"), from PIE base *gwhen- "to strike, kill, wound" (cf. Avestan banta "ill"). Modern sense of "that which causes ruin