low tide
noun/ˌləʊ ˈtaɪd/
/ˌləʊ ˈtaɪd/
(also low water)
[uncountable, countable]- the time when the sea is at its lowest level in a particular place; the sea at this time
（大海的）低潮时期，低潮 - at low tide The island can only be reached at low tide.
这座岛只能在退潮时上去。
- at low tide The island can only be reached at low tide.