cut your teeth on something
cut (one's) teeth on (something)
To gain experience with something, especially at a young age (when one's teeth would be coming in). Oh, I cut my teeth on those kinds of equations! Give me a challenging problem for a change! Jen may be young, but she cut her teeth on academic writing, so her perspective and expertise will be invaluable to us.
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cut your ˈteeth on somethinglearn or gain experience from something: It was a small experimental theatre company and many of today’s most successful actors cut their teeth there.
Farlex Partner Idioms Dictionary © Farlex 2017