問うに落ちず語るに落ちる
とうにおちずかたるにおちる
to keep a secret when asked about it, but let it slip inadvertently when chatting on another occasion
語るに落ちる is read as かたるにおちる (kataruniochiru) and means to let slip a secret.
かたるにおちる
kataruniochiru
とうにおちずかたるにおちる
to keep a secret when asked about it, but let it slip inadvertently when chatting on another occasion