to  keep   something  under one's hat
keep
ki:p
kip
something
ʌndə
andē
under
wʌnz
vanz
<i>one's</i>
hæt
hāt
hat

英語での「 keep something under one's hat」の定義と意味

to keep something under one's hat
01

to avoid sharing a secret with others 

慣用句
くだけた
Before the surprise party, she asked everyone to keep it under their hat to ensure the birthday celebrant remained unaware. 
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