Broadened his horizons
By metaphor: learned and enriched his knowledge in different fields.
(Modern Hebrew)
Translation
Expression (Hebrew)
הִרְחִיב אֶת אֳופָקָיו
Definition (Hebrew)
בְּהַשְׁאָלָה: לָמַד וְהֶעֱשִׁיר אֶת יְדִיעוֹתָיו בִּתְחוּמִים שׁוֹנִים.
(הָעִבְרִית הַחֲדָשָׁה)