The reward (or retribution) of his own hands.
Punishment for one’s deeds.
("Woe to the wicked man, evil, for the recompense of his hands shall be done to him" - Isaiah 3:11)
Translation
Expression (Hebrew)
גְמוּל יָדָיו
Definition (Hebrew)
עֹנֶשׁ עַל מַעֲשָׂיו.
("אוֹי לְרָשָׁע רָע כִּי גְמוּל יָדָיו יֵעָשֶׂה לּוֹ"- יְשַׁעְיָהוּ ג יָא)