godan verb (-su), transitive verb
Transitive verb meaning to make something slightly wet or damp. Often used for cloth, paper, or surfaces. Less common than the synonymous 湿らせる (しめらせる).
ハンカチを水で湿らす。
I dampen a handkerchief with water.
乾いたスポンジを湿らせてから使ってください。
Please moisten the dry sponge before using it.