plural upsides
: a part of something that is good or desirable : an advantage or benefit
One upside to the new house is its location.
On the upside [=when you consider the good parts or advantages], the car does have a lot of trunk space.
—often + ofThe upside of moving would be a shorter commute to work.
US, informal
: on or against the side of (something)
She smacked him upside the head. [=she hit/slapped him on the side of his head]
Cite this Entry
“Upside.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/upside. Accessed 14 Apr. 2026.
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