underground
Translation
underground, subterranean, secret, the tube
Examples
They found an underground river.
They found an underground river.
The resistance movement went underground.
The resistance movement went underground.
The London Underground is famous.
The London Underground is famous.
Grammar Patterns
an underground ((noun)) located below the ground. They found an underground river.
to go underground to operate in secret. The resistance movement went underground.
the underground a system of trains under a city. The London Underground is famous.
Similar Words
Synonyms (adj): subterranean, secret; Synonyms (noun): subway, tube, metro
Etymology
From the prefix 'under-' and the noun 'ground'. It literally means 'below the ground'.
Memory Tips
The literal meaning 'under the ground' can refer to physical location (like a subway) or metaphorical secrecy (like a secret movement).