1. To fight off someone or something that is advancing. A noun or pronoun can be used between "fend" and "off." What is the best way to fend off an attacker?Her bodyguards tried to fend off all the photographers, but there were too many.
2. To try to prevent something. A noun or pronoun can be used between "fend" and "off." Getting a flu shot will help you to fend off future illness.
fend someone or something off
to hold someone or something off; to fight someone or something off. We knew we could fend them off only a little while longer.They could not fend off the attackers.
fend off
v.
1. To try to prevent something; avert something: To fend off cavities, brush your teeth regularly.
2. To turn something aside; repel something: The troops fended the enemy off. My neighbor fended off the reporters who blocked her driveway.