是loose Lose lips sink ships吧。下面是来自网上英文字典，翻译下中文对照你可以参考下
意思是不小心没戒心的把或许对敌人非常有用的信息泄露了给他，祸从口出。
Meaning Unguarded talk may give useful information to the enemy.
起源
这个短语来自二战时期的美军战争信息办公室的口号，意在防止人们不慎将有用的信息提供给了敌军间谍。口号完整的版本是“Loose lips Might sink ships".和这个口号形似的宣传都是来自战争所带来的基本意识"Careless Talk Costs Lives" (无意的谈话却要付出许多生命的代价。）
Origin
This phrase was coined as a slogan during WWII as part of the US Office of War Information's attempt to limit the possibility of people inadvertently giving useful information to enemy spies. The slogan was actually 'Loose Lips Might Sink Ships. This was one of several similar slogans which all came under the campaigns basic message - 'Careless Talk Costs Lives'.
