I. verb — [no obj.] 1.
• I waited with beating heart, not knowing what would betide.
2. [with obj.] —
‹literary› happen to (someone)
• she was trembling with fear lest worse might betide her.
II. phrases woe betide see woe.
– origin Middle English: from be- (as an intensifier) + obsolete tide ‘befall’, from Old English tīdan ‘happen’, from tīd (see tide).