Bartender (noun)

1. A person who works behind the bar and serves drinks to customers.
2. A person who prepares and serves drinks at a bar or in a restaurant.

Origin:

From the word 'bar' + 'tend' (to serve drinks).

Examples:

1. I always tip the bartender generously because they make great drinks.
2. The bartender asked us what we would like to drink.
3. My favorite bartender at the local pub knows my order by heart.
4. The bartender is an expert in mixing various cocktails.
5. I met my girlfriend when she was working as a bartender.