to collapse into;  to flop onto
 to fall flat;  to fall face down
 to collapse into;  to flop onto
 to fall flat;  to fall face down
 to topple over and lean at a precarious angle;  to fall onto something and lean against it;  to be on the point of collapse;  to be about to fall;  to begin to fall
 to fall flat;  to fall face down
 to topple over and lean at a precarious angle;  to fall onto something and lean against it;  to be on the point of collapse;  to be about to fall;  to begin to fall