play up

phrasal verb·2 senses·particle up

Meanings

1

Cause problems by misbehaving or malfunctioning

Why “up”? Something normal is disturbed. Feelings, systems, machines, or behavior become noisy, troubled, or out of control.

My back is playing up again.
My back is causing problems again.
The old knee played up during the walk.
The old knee caused problems during the walk.
2

Act in a way that pleases someone or a group

Why “up”? You try to please someone, so they will like you, approve of you, or help you.

The singer played up to the crowd.
The singer acted in a way the crowd would enjoy.
The candidate played up to local voters.
The candidate said things local voters wanted to hear.

Don't confuse with

play upplay out

Play up means cause trouble by not working well. Play out means develop over time.

play upplay on

Play up means act to please a person or group. Play on means use someone's fear or weakness.

Test yourself

My back is playing up again. What does it mean?

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