have light fingers这个短语原指“手指轻巧”，实际上常作“偷窃”的委婉语，表示“手脚不干净；有偷窃的习性”。

【例句】
His have light fingers, you need to be careful.
他的手脚不干净，你要注意一点。

He has light fingers and finally was caught by the police.
他有偷窃的习性，最后被警察抓住了。