to keep one's cards close to one's chest
01
手の内を明かさない, 本音を見せない
to refrain from revealing one's true intentions or plans
慣用句
くだけた
例
The negotiator kept his cards close to his chest during the business deal, not revealing his true bottom line to the other party.
合併交渉の間、CEOは最終提案が出るまで手の内を明かさなかった。



























