pro ‧ trude /prəˈtruːd $ proʊ-/ BrE AmE verb [intransitive] written
[ Date: 1600-1700 ; Language: Latin ; Origin: protrudere , from trudere 'to push' ]
to stick out from somewhere
protrude from
The envelope was protruding from her bag.
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In everyday English, people usually say stick out rather than protrude :
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The envelope was sticking out of her bag.
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His front teeth stick out.