find your voice/tongue
find (one's) tongue
To regain the ability to speak, especially after feeling frightened or nervous, or not knowing what to say. It took him a minute, but Pete found his tongue again after we startled him at his surprise party. The little boy, who had been huddled nervously at the back, found his tongue and told the detectives what happened.
find (one's) voice
1. To find one's distinctive style or vision of artistic expression. I think this is your best story yet, Betsy—you've really found your voice as a writer. It takes time to find your voice, but I'm confident you'll get there by the end of our photography class.
2. To regain the ability to speak, especially after something frightening or startling has happened. It took him a minute, but Pete found his voice again after we startled him at his surprise party.
find your tongue
If you find your tongue, you begin to talk, when you have been too shy, frightened, shocked or embarrassed to say anything before. All four men stared at him. It was Livingstone who found his tongue first.