backwash

(noun) the flow of air that is driven backwards by an aircraft propeller. Synonyms: slipstream, airstream, race, wash.

(noun) the consequences of an event (especially a catastrophic event). Synonyms: aftermath, wake. Examples: "The aftermath of war." "In the wake of the accident no one knew how many had been injured."

(noun) the wave that spreads behind a boat as it moves forward. Synonyms: wake. Examples: "The motorboat's wake capsized the canoe."