Under- is a prefix meaning “under” and is used in a variety of senses, including "below or beneath," "inferior," or " lesser." It is often used in a variety of everyday terms.

Under Armour builds game-changing sportswear, athletic shirts, shoes and more. FREE SHIPPING available and FREE returns on workout clothes, shoes, and gear.

Under is a preposition. When we use under as a preposition, it is similar to below.

Anything that's under is beneath something else. Most of us wear socks under our shoes and stand under an umbrella in the pouring rain.

Under, Below, Beneath, and Underneath: What’s the Difference? In this article, we’ll explore the distinctions among “under, below, beneath, and underneath” and provide examples to illustrate their proper use.

If you go under something, you move from one side to the other of something that is at a higher level than you. He went under a brick arch. A river boat passed under the bridge.

What part of speech is under? The part of speech of under is generally a preposition, but if it’s not introducing a noun phrase (i.e., it doesn’t have a prepositional object), then it’s typically categorized as an adverb.

We were constantly under bombardment. I can't live under these circumstances. The matter is under investigation.

Under is a preposition that indicates being below or beneath something else, having a lower position or rank, being subject to authority or control, or being within a certain condition or state.