At the coast, low tide is the time when the sea is at its lowest level because the tide is out.
The causeway to the island is only accessible at low tide.
low tide in British English
noun
1.
the tide when it is at its lowest level or the time at which it reaches this
2.
a lowest point
low tide in American English
1.
the lowest level reached by the ebbing tide
2.
the time when the tide is at this level
see also neap1
3.
the lowest point reached by anything
Examples of 'low tide' in a sentence
low tide
We find high tides and low tides on opposite sides of the Earth at the same time.
Times, Sunday Times (2016)
At this time, the difference between high and low tides is not very great.
Jilbert, John Geography Basic Facts (1983)
There are two high and two low tides in any one place in any 24-hour period, as highs replace lows and vice versa.
Times, Sunday Times (2016)
Jersey has one of the highest tidal ranges in the world, with as much as a 40ft difference between high and low tides.
Times, Sunday Times (2013)
Although high tides and low tides occur throughout the world, there are some places with no measurable tides, while not too far away there are normal tides.
Schneider, Hermann & Schneider, Leo The Harper Dictionary of Science in Everyday Language (1988)