The under-resourced school struggled to provide adequate resources for its students.

The under-served community lacks access to basic healthcare services.

The over-under for the game is set at 50 points.

The cluttered toys were under my feet, making it difficult to walk.

The Underground Railway was a network of secret routes and safe houses used by enslaved African Americans to escape to free states and Canada.

The underground railway is a convenient way to travel in the city.

The London Underground is the oldest underground railway in the world.

I like to read under the covers.

The underground railways in London are very efficient.

I accidentally clicked on a pop-under ad.