עד אם כלו. הֲרֵי אִם מְשַׁמֵּשׁ בִּלְשׁוֹן אֲשֶׁר, אִם כִּלּוּ דַי סִפּוּקוֹן, שֶׁזּוֹ הִיא גְּמַר שְׁתִיָּתָן, כְּשֶׁשָּׁתוּ דֵּי סִפּוּקָן:
עד אם כלו literally, UNTIL THAT THEY HAVE FINISHED [DRINKING] — Here the word אם is used in the sense of אשר “that”. The words אם כלו the Targum renders by "That they have done enough drinking”. Though the verb כלה signifies to finish, to end, the Targum is right in translating it thus for this is the end of their drinking when they have drunk as much as they wanted (cf. Rashi on Genesis 43:2).