flip side is a noun meaning "a different aspect of something (especially the opposite aspect)". It carries one recorded sense.
a different aspect of something (especially the opposite aspect)
“the flip side of your positive qualities sometimes get out of control”
“on the flip side of partnerships he talked about their competition”
trope
Definitions, synonyms and semantic relations for flip side come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.