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rising tide; incoming tide; flood tide
surge (in popularity, power, etc.); upswing
上潮に乗って船は港に入った。
Riding the rising tide, the ship entered the port.
上潮の時間帯は泳ぐのに注意が必要だ。
Caution is needed when swimming during flood tide.
夕方から上潮が始まる見込みだ。
The flood tide is expected to start in the evening.