Silat is a type of martial art that comes from Southeast Asia. When people practice silat, they use their whole body to fight and defend themselves.
One very important move in silat is called the bridge. When people use the bridge move, they basically make a bridge with their arms and use it to protect themselves from getting hit or attacked.
Imagine you are playing a game of tag and someone is trying to tag you. Instead of running away, you put your arms up high like a bridge and duck underneath them. Now the person can't tag you because they can't get past your bridge arms!
So in silat, when someone tries to punch or kick you, you use your bridge arms to block the attack and keep yourself safe. It's like building a strong, protective bridge in front of you.