He did good to his head (he did good to his hair) / to comb one's hair
To arrange or adorn the hair of one's head.
("And Jehu came to Jezreel, and Jezebel heard, and she put on her eyes, and let her head rest, and she looked out at the window" - 2 Kings 133)
Translation
Expression (Hebrew)
הֵיטִיב אֶת רֹאשׁוֹ (הֵיטִיב שְׂעָרוֹ)
Definition (Hebrew)
סִדֵּר אוֹ קִשֵּׁט אֶת שֵׂעָר רֹאשׁוֹ.
("וַיָּבוֹא יֵהוּא יִזְרְעֶאלָה וְאִיזֶבֶל שָׁמְעָה וַתָּשֶׂם בַּפּוּךְ עֵינֶיהָ וַתֵּיטֶב אֶת רֹאשָׁהּ וַתַּשְׁקֵף בְּעַד הַחַלּוֹן"- מְלָכִים ב ט ל)