Meaning of “stepping-stone” - Learner’s Dictionary

stepping-stone

noun [ C ] uk us /ˈstepɪŋstəʊn/
METHOD

an event or experience that helps you achieve something else:

Education is a stepping-stone to a good job.
STONE

one of several stones that you walk on to cross a stream

(Definition of “stepping-stone” from the Cambridge Learner’s Dictionary © Cambridge University Press)