Tide
Old English tīd ‘time, period, era’, of Germanic origin; related to Dutch tijd and German Zeit, also to time. The sense relating to the sea dates from late Middle English.
wiktionary
From Middle English tyde, tide, tyd, tid, from Old English tīd(“time”), from Proto-Germanic *tīdiz(“time”), from Proto-Indo-European *déh₂itis(“time”), from Proto-Indo-European *deh₂y-(“to divide”). Related to time.
From Middle English tiden, tide, from Old English tīdan(“to happen”).
etymonline
tide (n.)
Old English tīd "point or portion of time, due time, period, season; feast-day, canonical hour," from Proto-Germanic *tīdi- "division of time" (source also of Old Saxon tid, Dutch tijd, Old High German zit, German Zeit "time"), from PIE *di-ti- "division, division of time," suffixed form of root *da- "to divide."
Meaning "rise and fall of the sea" (mid-14c.) probably is via notion of "fixed time," specifically "time of high water;" either a native evolution or from Middle Low German getide (compare Middle Dutch tijd, Dutch tij, German Gezeiten "flood tide, tide of the sea"). Old English seems to have had no specific word for this, using flod and ebba to refer to the rise and fall. Old English heahtid "high tide" meant "festival, high day."
tide (v.)
"to carry (as the tide does)," 1620s, from tide (n.). Usually with over. Earlier it meant "to happen" (Old English; see tidings). Related: Tided; tiding.
