Nihoner

“To harden one's heart” in Japanese

Short answer
鬼になる onininaru onininaru

To harden one's heart in Japanese is “鬼になる” (onininaru). Full meaning: to harden one's heart, to steel oneself, to be ruthless; to become "it" (in hide-and-seek, etc.).

Other ways to say “To harden one's heart” in Japanese

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