crumble
break or fall apart into small fragments, especially over a period of time as part of a process of deterioration
avoid
to keep away from something
wait
to stay in a place or delay doing something until a certain event happens.
fade
to disappear slowly.
shuffle
to mix things up to change their order.
swap
to give one thing in return for something else.
flap
to move up and down.
roll
to move on wheels.
repeat
to say or do something again.