Compounds of 合い

• 押し合い圧し合い
  (n,vs) pushing and shoving
  jostling
  hustling
• 合いの手を入れる
  (exp) to make a gesture or say something during a break in conversation, playing of songs, etc.
  to interrupt
• 付き合いきれない
  (exp) cannot handle (it) any longer
  fed up with
  enough is enough
• 狐と狸の化かし合い
  (exp) two sly characters outfoxing each other