亦敌亦友

亦敌亦友	yì dí yì yǒu	(idiom) to be both friend and foe to each other; to have a friendly rivalry
亦	yì	also
敌	dí	(bound form) enemy / (bound form) to be a match for; to rival / (bound form) to resist; to withstand
亦	yì	also
友	yǒu	friend