a cat in gloves catches no mice直译带手套的猫捉不到耗子，引申为四肢不勤, 一事无成。

【例句】
A cat in gloves catches no mice , Jill. Tell her bluntly that you need the money.
吉尔，过分谨慎可能一事无成。你就直接告诉她让她还钱就行了。

I think you'll get that promotion if you pursue it more assertively. A cat in gloves catches no mice, after all.
我想如果你坚决果断地追求，你会得到晋升的。毕竟，缩手缩脚会一事无成。