cut teeth on
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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
cut (one's) teeth on
To learn or do as a beginner or at the start of one's career.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.