dis·in·te·grate /dɪsˈɪntəˌgreɪt/ verb dis·in·te·grates; dis·in·te·grat·ed; grat·ing
: to break apart into many small parts or pieces [no obj] ▪ The old iron hinge rusted and eventually disintegrated [=crumbled] into dust. ▪ The paper will disintegrate if it gets wet. — often used figuratively ▪ Their relationship gradually disintegrated. ▪ With the rise of nationalism, the colonial empires began to disintegrate. [+ obj] ▪ The laser can disintegrate most kinds of rock.
— dis·in·te·gra·tion /dɪsˌɪntəˈgreɪʃən/ noun