Is under his hand/ to be in possession of
Is in his possession; is at his disposal.
("And now what do you have under your hand? Give me five loaves of bread, or whatever is available" — 1 Samuel 21:4, David to Ahimelech the priest in Nob)
Translation
Expression (Hebrew)
יֵשׁ תַּחַת יָדוֹ
Definition (Hebrew)
נִמְצָא בִּרְשׁוּתוֹ. מָצוּי בְּחֶזְקָתוֹ.
("וְעַתָּה מַה יֵּשׁ תַּחַת יָדְךָ חֲמִשָּׁה לֶחֶם תְּנָה בְיָדִי אוֹ הַנִּמְצָא"- שְׁמוּאֵל א כא ד, דָּוִד לַאֲחִימֶלֶךְ הַכֹּהֵן בְּנֹב)