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You almost never hear betide as an ordinary verb now. What you will hear — often with a small smile — is woe betide someone. It means: if that person does this, they will be in trouble; something bad will come their way. “Woe betide anyone who eats the last .” It sounds old, like a warning in a story, so people use it more in fun than in real anger. Though actually, the word itself only means “to happen to” someone. Long ago you could say whatever may betide — whatever happens. That wider use has nearly died. The set phrase with woe is what is left.
（禍）降臨；「要是…就慘了」（古／戲謔）
組成be- (an old prefix that fills out the verb) + an old verb “to happen,” from Old English tīdan, related to tīd “time.” So the picture is “to happen to someone.”
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
betideverb/bɪˈtaɪd/
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datedliteraryOften used in a prediction (chiefly in woe betide) or a wish: to happen to (someone or something); to befall.
- Whether good or ill betide you, trust in yourself.
- Why wayle we then? why weary we the Gods with playnts, / As if ſome euill were to her betight? / She raignes a goddeſſe now emong the ſaintes, / That whilome was the ſaynt of ſhepheardes light: / And is enſtalled nowe in heauens hight.
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datedliteraryChiefly in the third person: to happen; to take place; to bechance, to befall.
- If he were dead what would betide of me.
- [W]ipe thou thine eyes, haue comfort, / The direfull ſpectacle of the wracke which touch'd / The very vertue of compaſſion in thee: / I haue with ſuch prouiſion in mine Art / So ſafely ordered, that there is no ſoule / No not ſo much perdition as an hayre / Betid to any creature in the veſſel / Which thou heardſt cry, which thou ſaw'ſt ſinke: […]
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。