out of one's shell
out of one's shell {adv. phr.}, {informal}
Out of one's bashfulness or silence; into friendly conversation. — Usually used after "come".
John wouldn't come out of his shell and talk to the boys and girls at the party.
The other girls tried to draw Ella out of her shell, but without success.
Contrast: IN ONE'S SHELL.
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Source: A Dictionary of American Idioms