noun
a large group of people gathered closely together
adverb
in a manner that involves a large group of people gathered closely together
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The security guards had to crowd in to control the large group of protesters.
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Let's crowd in together so we can all fit in the photo.
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We should crowd in at the front of the line to get the best view.
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Negative thoughts can crowd in and make it hard to focus on the positive aspects of life.