To Moisten
To Dampen
transitive verb, ichidan verb
Remember how 湿る is "to be moist"? This is the version where you're doing the moistening, making it to moisten or to dampen.
The reading is the same as 湿る.
唇を舐めて湿らせることは、結局その後乾燥させてしまうことになりうるので、あまりいいことではありません。
Licking your lips to moisten them isn’t good because it can actually dry them out instead.