From Longman Dictionary of Contemporary Englishdissolve into/in laughter/tears etcdissolve into/in laughter/tears etcto start laughing or crying She dissolved into fits of laughter. → dissolve
Examples from the Corpus
dissolve into/in laughter/tears etc• If he mentioned moving out of her parents' house, she dissolved into tears.• Katherine threw herself against Gary and dissolved into tears.• The waiter bowed and retreated, Stephen and Lily dissolved into laughter.• When at last she is alone, her sorrow overwhelms her and she dissolves in tears.• Francis and Christopher dissolved in laughter, lapped theirs up and declared it very good. 