Definitions

1. verb

to make (something) slightly wet; to add moisture to

“The nurse moistened the patient’s lips with water.”

2. verb (transitive)

to make (something) slightly damp or wet, typically so that it can be handled or used more easily

“Please moisten the paintbrush before using it.”

3. verb (intransitive)

to become slightly damp or wet, typically due to the absorption of moisture from the air

“The paper began to moisten in the humid atmosphere.”

4. noun

the act of making something slightly wet

“The moistening of the paintbrush was a crucial step in the art project.”