笔下留情 [- - liú qínɡ]be merciful in writing; forbear in making critical remarks (not to hurt feelings); refrain from abusing one by writing; spare sb. in making critical attacks:
•¶ 对于反动派， 鲁迅是从来不讲什么笔下留情的。 In his writing, Lu Xun was never sparing in his criticism of the reactionaries.