Moisten (verb)

1. Make or become slightly wet.
2. Add a small amount of liquid to (something) in order to make it wetter.

Origin:

Late middle english: from old french moisten, from latin humidare, from humidus "moist".

Examples:

1. Moisten a dry cloth with water.
2. Moisten the soil with a watering can.
3. Moisten the turkey with a little stock.
4. Moisten the cake with syrup.
5. Moisten your lips with a little water.