find one's ---
find one's --- {v. phr.}
To become able to use (some power of the body or mind.)
In the program for the parents, John was nervous and could not speak at first; then he found his tongue.
The young bird had just found its wings.
The baby was just beginning to find his feet.
The question surprised him, and it was a minute before he found his tongue.
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Source: A Dictionary of American Idioms
