fugitive 漏网之鱼

“漏网之鱼”，汉语成语，字面意思是逃脱渔网的鱼（fish that escaped the net）。比喻侥幸逃脱的罪犯或敌人。可以翻译为“fugitive，runaway或those who escaped punishment”等。

例句：

官员们担心英国警方指认的一些罪犯可能已成为漏网之鱼。

Officials fear some of the thugs identified by British police may have slipped through the net.