The Great Wall of China
Shi Huangdi built the first incarnation of the Great Wall of China to protect China from invaders to the North.
No single Internet site can be completely safe from malicious attack. Google's significant capital allows for it to fend off any and all intruders and stay very secure, however.
The male California sea lion engages in territorial displays when others approach their territory. These displays involve continuous "barking" and pushing the intruder away. They may even bite.
Fend is already in the present tense. I/We/You/They fend; He/She/It fends.
I/you/we/they fend. He/she/it fends.
Peter Fend was born in 1950.
Fritz Fend died in 2000.
Fritz Fend was born in 1920.
Fend off, mate!
the rock stars had to fend off the screaming and swarming girls as they exited the building
bend lend fend tend spend rend send
Sometimes people must fend for themselves.