The tide is the regular change in the level of the sea on the shore.

A tide is a current in the sea that is caused by the regular and continuous movement of large areas of water towards and away from the shore.

The tide of opinion, for example, is what the majority of people think at a particular time.

People sometimes refer to events or forces that are difficult or impossible to control as the tide of history, for example.

You can talk about a tide of something, especially something which is unpleasant, when there is a large and increasing amount of it.