He was alone with his grief (He was alone with...)
To concentrate on one's sorrow. Or: to isolate oneself alone with one's sorrow without sharing one's emotions with others.
(Modern Hebrew)
Translation
Expression (Hebrew)
הִתְיַיחֵד עִם צַעֲרוֹ (הִתְיַיחֵד עִם...)
Definition (Hebrew)
הִתְרַכֵּז בְּצַעֲרוֹ. אוֹ: הִסְתַּגֵּר לְבַדּוֹ עִם צַעֲרוֹ מִבְּלִי לְשַׁתֵּף אֶת הַזּוּלָת בְּרִגְשׁוֹתָיו.
(הַעַהַרִית הַחֲדָשָׁה)