tīd

Tīd in Old English meant time, hour, season, or period. It cognates with German Zeit (time) and Dutch tijd (time). Christmastide, Yuletide, eventide, noontide — all of these preserve the original meaning. The word was about when, not about water. The connection to the sea came later, through the observation that the water rises and falls at regular times.

By the fourteenth century, the oceanic meaning was established. The rhythm of the sea — its predictable rise and fall, governed by the moon — was the most obvious manifestation of time's regularity visible to coastal communities. The tide came in at a certain time and went out at another. Time and tide were, for a while, the same word because they were the same observation: something that happens on schedule.

The phrase 'time and tide wait for no man' preserves the moment when the two meanings were separating. In Old English, it would have been redundant — time and time wait for no man. By the time the proverb reached its modern form (attributed to various sources from the 1200s onward), 'tide' was already shifting toward its maritime meaning, and the phrase needed both words because they were becoming different.

German kept Zeit for time and never transferred it to the ocean. Dutch kept getij for tide and tijd for time — separate words for separate things. English alone merged and then split them. The ocean tide is now the primary meaning. The time-tide survives only in compound words that sound archaic: eventide, noontide, Eastertide. The sea took the word from the clock.