A lick is a small amount of liquid that you take with your tongue. You can also use the word as a verb to describe the action of taking that small amount.
When we talk about licking something, it usually means using our tongues to taste or get rid of something on an object. For example, if you have a sticky candy wrapper stuck to your fingers, you might need to lick it clean. Some dogs like to lick their owners' faces as a way of showing affection. And when you're eating a lollipop, you'll use a lot of small licks to enjoy the sweet treat. People also often talk about licking wounds or injuries to help them heal faster by keeping them moist and clean.
(transitive) To stroke with the tongue.
Example: The cat licked its fur.
