相引 is read as そういん (souin) and means coupling.
そういん
souin
ひけそうば
closing price (stock-market)
そうさい
killing each other
あいて
opponent (sports, etc.)
そうば
market price
そうとう
considerable
そうだん
consultation
あいかわらず
as usual
そうぞく
inheritance
そうい
difference
そうご
mutual
あいてがた
other party
そうだんじょ
consultation office