the world > movement > impact > striking > striking in specific manner > strike in specific manner [verb (transitive)] > suddenly (3)
flap?a1400
transitive. To strike with a sudden blow. Also with down, in sunder. In later use chiefly implying a stroke with a blunt weapon. Obsolete exc. dialect…
flop1888
To strike with a sudden blow. to flop up (the eyes): to bung up; = flap, v. 1. dialect.
zap1942
To kill, esp. with a gun; to deal a sudden blow to.