:to express criticism in a mild or kind way温和批评 — usually used in negative statements通常用于否定句
When he has something bad to say about a movie, he doesn't pull his/any punches. [=he does not try to make his criticisms seem less harsh than they are]他对一部影片有什么负面看法时，从来不会嘴下留情。
The report pulls no punches in blaming the government for this crisis.这篇报道毫不留情地批评政府对这次危机负有责任。