The Britannica Dictionary - Idiom: keep (something) under your hat = to keep (something) secret; to not tell anyone about (something) I'll tell you what happened, but you have to keep it
![Vintage World War II propaganda poster featuring an Army helmet. It reads, Keep it under your hat! Careless Talk Costs Lives. Poster Print - Item # VARPSTJPA100940M - Posterazzi Vintage World War II propaganda poster featuring an Army helmet. It reads, Keep it under your hat! Careless Talk Costs Lives. Poster Print - Item # VARPSTJPA100940M - Posterazzi](http://c328301.r1.cf1.rackcdn.com/PSTJPA100940M.jpg)
Vintage World War II propaganda poster featuring an Army helmet. It reads, Keep it under your hat! Careless Talk Costs Lives. Poster Print - Item # VARPSTJPA100940M - Posterazzi
Lifestyles of Saratoga - Keep it under your hat 👒 beat the heat and the ☀️ sun in style with one of our UPF + 50 hats , many are crushable/ packable
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