Small holes made by bullets or other projectiles.
Shotholes are usually a sign of danger or violence.
Examples:
The wall was full of shotholes from the battle.
The shotholes in the window let the light in.
The shotholes in the tree showed where the hunters had been.
The old building had so many shotholes, it looked like a big piece of cheese.
The shotholes in the ground were so many, it looked like a big ant had been there.
The shotholes in the metal were so small, you could hardly see them.