in one's shell


Also, into one's shell. In a quiet or withdrawn state. For example, Jim is extremely shy; if you try to get him to talk he immediately goes into his shell. This usage alludes to the shell as a protective covering and dates from about 1800, as does the antonym, out of one's shell, as in Once Anne is out of her shell she's very articulate. However, the same expression was also used from the 1500s on to denote being young and inexperienced, alluding to a baby bird that had not quite emerged from its shell.

QUIZZES

LEARN THE SPANISH WORDS FOR THESE COMMON ANIMALS!

Are you learning Spanish? Or do you just have an interest in foreign languages? Either way, this quiz on Spanish words for animals is for you.
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How do you say “cat” 🐈 in Spanish?
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.