intervene
step in
interpose
interfere
interject
embroil
get in on the act
mediary
burn that bridge when one comes to it
involve
stage right
take the wheel
intercome
play into someone's hands
roll
stave off
stimulate
motivate
have the cards in one's hands
turn to
be
move
step up to the plate
antipositional
seductive
know what one is about
amenable
make
go in for
endangerment
counteract
make hay while the sun shines
be active
tighten up
not know which way to turn
meddle
unlock
face the music
intervention
have a hand in
get what's coming to one
propel
have a finger in
dispose
draw into
bind over
incline
-ent
preventive
turn one's hand to
drop the gloves
set about
shuffle
thwarten
sow dragon's teeth
partake
see one's way clear to
counter
gateway
treat
anticipate
know which side one's bread is buttered on
expose
gateway drug
provide
choose
pull the trigger
seal someone's fate
cross the Rubicon
pay the fiddler
govern
proactive
see to
Nance
toe-dance
pick a lane
detain
oppose
interventive
put a gun to someone's head
avoid
arm
bent
deal with
clear the decks
arise
end run
draw in
preventionism
interference
take
forbear
watch the feathers fly