Side
Underside
Underside noun - The lower side of anything.
Both words in one sentence
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When he is knocked off the armoured car Two-Face is trying to hijack, he manages to cling to the underside of the truck and climb under it to come up on the other side.
Source: Underside Ride -
As part of her Skylanders redesign, the plates on Cynder's underside were modified so that her upper chest has two plates side by side and are noticeably round, while the rest of the plates are flat.
Source: Non-Mammal Mammaries -
The way optical disks are built is that the underside can be scratched all to hell as long as they aren't deep enough to go to the data side.
Source: Tonka Tough
Cite this Source
Underside and Side. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/side/underside
Side & Underside. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/side/underside>.
Underside or Side. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/side/underside.
Google Ngram Viewer shows how "side" and "underside" have occurred on timeline