turn the tide

Buggins's turn

A humorous, disparaging term for the appointment of a person by rotation or promotion, on the basis of length of service (it being that person's "turn") rather than merit or level of qualification.

good turn

A good deed; a thoughtful or selfless act.

left turn

An unexpected change from the way things seemed to be going.

serve the turn

To suffice for one's immediate purpose or need.

star turn

An acting performance which causes the performer to become renowned.

stem the tide

To slow or stop the flow of something.

take a turn

Change in direction, tone, or tendency.

take a turn for the better

To start to become better; to improve.