move to and fro

The tensions between these plates as they move to and fro causes everything from earthquakes to volcanic eruptions to the slow reshaping of continents.

Until 1 October, Ukrainians were able, with difficulty, to move to and fro across the front lines.

The footage then shows a brief flurry of jostling bodies that move to and fro, as the officer in the middle appears to strike Johnson.

The Tillermans silently watched the people move to and fro past them.

"In place of the shuttle going round in a circle," he told the workshop owner, "I would have it move to and fro in a straight line, and in place of the needle bar pushing a curved needle horizontally, I would have a straight needle moving up and down."