A sap is a watery liquid in a plant that carries food and water to the different parts of the plant.
Sap is important for plants to live and grow.
Examples:
The tree's sap is very sweet.
The maple tree's sap is used to make syrup.
The sap helps the tree grow big and strong.
I think the tree's sap is like its blood.
The sap in the tree is like the water in our bodies.
The sap in the tree is like the food in our fridge.
To sap something means to make it weaker or to use up its strength or energy.
Sapping something is usually not a good thing.
Examples:
The long walk sapped all my energy.
The hot sun sapped the strength from the plants.
The hard work sapped all the fun from the game.
The long meeting sapped my patience.
The sad news sapped all the joy from the day.
The boring class sapped all my energy.