turn into a pumpkin

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.

pumpkin head

A severe head injury resulting from a beating.

serve the turn

To suffice for one's immediate purpose or need.

star turn

An acting performance which causes the performer to become renowned.

take a turn

Change in direction, tone, or tendency.

take a turn for the better

To start to become better; to improve.