Definition of betide verb from the Oxford Advanced Learner's Dictionary

 

betide

 verb
verb
BrE BrE//bɪˈtaɪd//
 
; NAmE NAmE//bɪˈtaɪd//
 
 
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Word Origin Middle English: from be- (as an intensifier) + obsolete tide ‘befall’, from Old English tīdan ‘happen’, from tīd ‘time, period, era’, of Germanic origin; related to Dutch tijd and German Zeit, also to time.Idioms
woe betide somebody, woe to somebody
 
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(formal or humorous) a phrase that is used to warn somebody that there will be trouble for them if they do something or do not do something Woe betide anyone who gets in her way!
See the Oxford Advanced American Dictionary entry: betide