to become of less value or worse (in quality)

decay, degenerate

(of an engine, pipe etc) to become filled with ice and not work

become, make afraid or distressed

(to cause a person, thing, pile etc) to be unsteady and fall (over)

fall or knock over; overthrow

a fall; to fall, especially quickly; to move in a restless or disorderly way

fall or make fall awkwardly