in one's shell
in one's shell or into one's shell {adv.} or {adj. phr.}, {informal}
In or into bashfulness; into silence; not sociable; unfriendly.
After Mary's mother scolded her, she went into her shell.
The teacher tried to get Rose to talk to her, but she stayed in her shell.
Contrast: OUT OF ONE'S SHELL.
Categories:
Source: A Dictionary of American Idioms
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