Cut (one's) teeth verb phrase
Followed by the preposition "on"
To obtain your first experience, especially when you are young
I cut my teeth on household chores such as cleaning the house or washing dishes when I was just 6 years old.
She cuts her teeth on playing piano everyday so that she can become a distinguished piano player in the future.
The verb "cut" must be conjugated according to its tense.
This term dates back to the late 1600s and refers to the literal verb "to cut teeth," which means "to grow the first teeth of a baby".
A humorous way of saying that what one has said is just what they acknowledge and may not be entirely accurate
Mike: Have you returned from your vacation on the beach? Your skin seems to get tanned.
Jenny: My skin is always dark. That's my story and I'm sticking to it!