Correct spelling for the English word "be tide" is [biː tˈa͡ɪd], [biː tˈaɪd], [b_iː t_ˈaɪ_d] (IPA phonetic alphabet).
The word "be tide" is derived from the Old English term "tīdian", which means "to happen, take place". In Old English, "tīd" referred to a point in time or a period, while the verb "tīdian" referred to the occurrence or happening of an event. Over time, the words "tīd" and "tīdian" eventually developed into "tide" and "betide" in modern English. "Betide" is used as an intransitive verb meaning "to happen" or "to occur".