if you can't beat them, join them
symmachy
battle
smell blood
oppositionality
with friends like these who needs enemies
the enemy of your enemy is your friend
attack is the best form of defence
paromologia
paromology
gangpile
outvie
pile on
outrival
antiguerrilla
fraternize
betrayal
alliance
infight
antirebel
adversarialness
Titanic
outduel
engage
quisle
fraternization
titanic
ally
anticonflict
contest
adversariality
break
tank
outfight
boyg
adversariness
bluff
comradely
synergize
Quislingism
fraternise
mucker
compete
enemyness
come to the scratch
flypaper theory
gameness
nerve
parley
anticartel
conflicting
fellowlike
asymmetric warfare
full-court press
opp
opposed
collaborationism
two can play that game
brigade
the enemy of my enemy is my friend
Trojan horse
battle buddy
spiky
unfriend
coopetitor
suki
antipathist
fifth column
score off
encounter
antagonist
fraternisation
opposition
rush
foeman
enemy
foe
cooperability
pit
taste blood
collaboration
coupe-gorge
unity is strength
nonenemy
matched
match
measure swords with someone
oppose
play off
beware of Greeks bearing gifts
beard the lion in his den
quislingism
united we stand, divided we fall
warfaring