source: [ある海岸で波が恐ろしいほど速く押し寄せてきて早いスピードで引いていく引き潮と満ち潮のGIF画像｜無料GIF画像検索 GIFMAGAZINE 37682]

the alternate rising and falling of the sea, usually twice in each lunar day at a particular place, due to the attraction of the moon and sun:

〖通例単数形で〗潮(の干満), 潮汐

e.g. the changing patterns of the tides

e.g. they were driven on by wind and tide.

the water as affected by the tide:

潮流

e.g. the rising tide covered the wharf.

a powerful surge of feeling or trend of events:

〖通例単数形で〗(意見などの)形勢, 傾向; (歴史などの)流れ, 時流

e.g. he drifted into sleep on a tide of euphoria

｟否定的に｠ 〖単数形で〗(犯罪･失業などの)大波, 風潮; (大勢の人の)流れ, 人波

e.g. he could not control the growing tide of violence.

archaic drift with or as if with the tide.

(流れのままに)漂う

(of a ship) float or drift in or out of a harbor by taking advantage of favoring tides.

reverse the trend of events: the air power that helped to turn the tide of battle.

help someone through a difficult period, especially with financial assistance: she needed a small loan to tide her over.

tideless | ˈtīdləs | adjective

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.