pull one's punches

pull one's punches  {v. phr.},  {informal}

1. Not to hit as hard as you can.

Jimmy pulled his punches and let Paul win the boxing match.

2. To hide unpleasant facts or make them seem good. — Usually used in the negative.

The mayor spoke bluntly; he didn't pull any punches.

Contrast: STRAIGHT PROM THE SHOULDER.