Definitions:
move from a higher to a lower level, typically rapidly and without control

(of a person) lose one's balance and collapse

decrease in number, amount, intensity, or quality

be captured or defeated

pass into a specified state, situation, or position

an act of falling or collapsing

a thing which falls or has fallen

a decrease in size, number, rate, or level

a defeat or downfall

autumn

a flock of woodcock