1. burst out, express, show, evince

usage: give sudden release to an expression; "We burst out laughing"; "'I hate you,' she burst out"

2. pop out, burst out, appear

usage: appear suddenly; "Spring popped up everywhere in the valley"

3. erupt, irrupt, flare up, flare, break open, burst out, intensify, deepen

usage: erupt or intensify suddenly; "Unrest erupted in the country"; "Tempers flared at the meeting"; "The crowd irrupted into a burst of patriotism"

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