Pressure waves in the atmosphere similar to the tides of the ocean, produced by the gravitational influence of the moon and by thermal expansion and contraction.

The interval between consecutive high tides at a given place.

A sundial marking canonical hours. / An elliptical plate marking the state of the ocean tides.

An opening through which water may flow freely when the tide moves in one direction, but which closes automatically and prevents the water from flowing in the other direction.

The period between high tide and the next low tide in which the sea is receding.

The period between low tide and the next high tide in which the sea is rising. / (by extension) The highest point of something; a climax.

(transitive, idiomatic) To support or sustain (someone), especially financially, for a limited period. / (transitive, obsolete outside India) To endure; weather.

The natural tide at its highest level for a particular tidal cycle at a certain place. / The time of day when the sea has risen to its highest level. / (figuratively) climax, culminating point or phase

The tide at its lowest level for a particular tidal cycle at a certain place. / The time of day when the sea has receded to its lowest level.

An algal bloom of sufficient quantity to cause discoloration (often red) in a body of water; red tides can potentially cause irritation or death to exposed creatures.