Definition from Wiktionary, the free dictionary
First attested circa 1325; first used in the figurative sense circa 1653.
- enPR: stĕpʹĭng-stōn′
- A stone that can be stepped on in crossing something, especially a marsh or creek.
- (idiomatic) Something used as a way to progress to something or somewhere else.
stone used to cross something
something used as a way to progress