pour or sprinkle water over (a plant or area) in order to encourage plant growth

I went out to water the geraniums

(of a person's eyes) fill with tears

Rory blinked, his eyes watering

dilute or adulterate (a drink, typically an alcoholic one) with water

staff at the club had been watering down the drinks

increase (a company's debt, or nominal capital) by the issue of new shares without a corresponding addition to assets