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soltarse a

to start doing something suddenly or spontaneously; to burst into

→ soltar
phrase Rare #40,555
to start doing something suddenly or spontaneously; to burst into Usually followed by an infinitive, as in soltarse a llorar (to burst into tears) or soltarse a reír (to burst out laughing).
SP: Al escuchar el chiste, puede soltarse a reír.
EN: When he hears the joke, he may burst out laughing.