Underside

How to spell underside

9 letters · 3 syllables

How to pronounce underside

Say the part in capitals loudest.

What does underside mean?

1. nounThe lower or bottom surface of something, often hidden from normal view.

Underside in a sentence

• The mechanic checked the underside of the car for rust.

• A thin layer of moss covered the underside of the bridge.

Where does underside come from?

Language of origin: Germanic

This is a transparent native English compound, joining the Old English preposition 'under' (meaning 'beneath' or 'below') with the noun 'side', which descends from Old English 'side', a word for the flank of the body and later any face or surface of an object. Both halves belong to the Germanic core of English and have close relatives across the family, such as German 'unter' and 'Seite'. The combined form is comparatively recent in the written record, appearing in English around the early nineteenth century as engineers and naturalists needed a plain word for the lower face of a thing. Because both parts are everyday words spelled exactly as they sound, the compound carries no hidden trap beyond remembering to write it as one closed word rather than two. The lasting popularity of 'side' in dozens of compounds (seaside, outside, alongside) shows how readily English has built new terms from it.

How the word is built

• under- (beneath)
• side (a surface or face)