互相

mutual transformation

depend on each other for existence; be interdependent

interpenetrate

become greatly attached to each other

improve each other by active discussion

work in coordination

be mutually exclusive

each using the other for his own ends

work in collusion

mutual interference

regard each other as an enemy

hold each other back; hamstring each other; make things difficult for each other

argue back and forth over trifles; engage in endless haggling and shifts of responsibility; endless disputes over trifles

undermine each other

eulogize each other; mutual admiration and eulogy

mutual love and admiration