Strafing

From TF2 Wiki

• Strafing is the act of moving from side to side during a confrontation in order to make it harder for an opponent to hit you.

• Circle strafe is the act of circling round an opponent in order to deal damage at close range while still making it difficult for their shots to hit you. Scouts can use Circle Strafing to run around a sentry gun and destroy it. Since sentries turn slowly, the Scout can in some cases destroy it without ever taking a hit.

• Zig-Zagging is when you strafe continually as you are running across an open space. Doing this makes it harder for Snipers to hit you, as well as other medium to long ranged classes.