- un|der|neath1 S2 [ˌʌndəˈni:θ US -ər-] prep, adv[: Old English; Origin: underneothan, from under + neothan 'below']1.) directly under another object or covered by it▪ He got out of the car and looked underneath.▪ It's near where the railway goes underneath the road.▪ She was wearing a smart jacket with a T-shirt underneath.▪ Her blonde hair was hidden underneath a baseball cap.see usage note ↑under2.) on the lower surface of something▪ The car was rusty underneath.▪ A number had been painted underneath the table.3.) used to say what someone's character is really like when their behaviour shows a different character▪ She seems confident, but she's really quite shy underneath.▪ I think he's a genuinely nice guy underneath it all .underneath 2underneath2 n BrEthe underneaththe bottom surface of something, or the part of something that is below or under something else= ↑the underside▪ We need to paint the underneath with a rust preventer.
Dictionary of contemporary English. 2013.