To break into pieces through being in a dilapidated state.(verb)
To be emotionally in crisis.(verb)
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Use "fall apart" in a sentence
"NOTE: Skip Bayless, still believing that the Yankees would fall apart and not come out of the AL East, suddenly became enamored with the surging Tampa Bay Rays, announcing on his First and 10 show that they would pass us in the standings."
"This cage-design theory appears to fall apart if, by some twist of fate, the hen inside it gets a gobful of her own yolk."
"I hear their buildings are already starting to fall apart in the winds, Mr. Ashburn said."