1. To pour a liquid on plants to keep them alive and producing: Shirley waters her flowers at least once a day during the summer.
2. To cause aqueous fluid to form in the eyes because of irritation or tiredness: Sharon's eyes were watering because she was very tired and it caused tears to form in her eyes.

When Jim's father heard the sad news about his neighbor's son, his eyes started watering.

3. To form saliva in the mouth: When a person sees food, smells food, or thinks about food, the mouth begins to water; especially, when he or she is hungry.
4. To give drinkable aquatic liquids to animals: The farmer waters his livestock when he feeds them.
5. To supply with fluids, as with channels, ditches, or streams: In agricultural productions, if there is not sufficient rain, then it is necessary to water the fields from the canals.