double play
feed two birds with one scone
double-acting
kill two birds with one stone
come of
two for two
procedure
process
succeedant
goal
achievement
reavowal
bistrategic
biformed
counterdecision
efficacy
bifunctional
while one is at it
aftercoming
happy landings
semisuccessfully
in one foul swoop
monoquantal
pass
interresponse
duopolistically
notch up
Newton's third law of motion
consolidation
make one's own luck
programming
termination
relate
to
Newton's third law
third law of motion
law of action and reaction
succedent
emulation
as
doubly
response
in two ways
effectiveness
procession
tweezer
when one's ship comes in
swy
bring to bear
twofoldly