Verse 84

भावाभावे पदार्थानां हर्षामर्षविकारदा ।मलिना वासना यैषा सा सङ्ग इति कथ्यते

In plain words

That defiled vāsanā which, in the presence or absence of things, brings about the disturbance of joy and resentment — that is called saṅga.