to change direction, especially suddenly

The bus driver swerved to avoid hitting a cyclist. 为了不撞上骑自行车的人，这辆公共汽车只好急转弯。

If you do not swerve from a principle or certain actions, you continue to think or act as you did in the beginning.

She is one of those rare politicians whom one can trust not to swerve from policy and principle. 她是一位难得可以信赖的政治家，不会背离自己的政策和原则。