Tafsiran Kejadian 24:20: Rashi, Chizkuni, Sforno & Radak

ותער AND SHE EMPTIED — It means “pouring out”. It occurs in this sense many times in the Mishna; e. g., (Avodah Zarah 72a), “He who pours (הטערה) from one vessel into another”, and we find it again in a similar sense in Biblical Hebrew: (Psalms 141:8) “O pour not out (תער) my soul”, and (Isaiah 53:12) “Because he poured forth (הערה) his soul unto death”

ותער כדה אל השוקת, “she poured the water in her jug into the trough (for the animals).” She observed the rule of not wasting water by pouring surplus water that Eliezer had not drunk into the trough meant for the camels to drink from, instead of pouring it back into the well.

ותמהר, by being quick in what one does, a person performing a service indicates that the one whom she serves is someone esteemed highly in his eyes. Rivkah expressed this by the speed with which she went about her tasks.

השקת THE TROUGH — a hollowed-out stone from which the camels drink.