Commentary for Genesis 24:20

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”

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.

ותמהר ותער כדה, she poured the water in the jug into a trough from which the beasts were in the habit of drinking.