jumping-off point is a noun meaning "a beginning from which an enterprise is launched". It carries one recorded sense.
a beginning from which an enterprise is launched
“he uses other people's ideas as a springboard for his own”
“reality provides the jumping-off point for his illusions”
“the point of departure of international comparison cannot be an institution but must be the function it carries out”
Definitions, synonyms and semantic relations for jumping-off point come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.