“AVAR” sounds like “OVER”. As a note, this verb can also mean to transgress, as in “you've crossed the line!”
Remember verbs are presented in the root (Heb: shoresh) form with period-like dots between the root letters. As we learn various forms the verbs take with different subjects, we will apply appropriate niqqud (vowels). When pronouncing them, we use the 3rd person masculine singular niqqud. (Qamets-patach.)
To remember the spelling: ayin =eye, vet = veterinarian. The veterinarian looks with his eye before he crosses over to the sick animal. One never knows when an animal will be aggressive, especially when not feeling well. So, a good animal doctor will keep his eye on his patient to avoid being bit.