The word pari is repeated when used in the sense of 'with the exception or exclusion of''.,
As परि परि त्रिगर्त्तेभ्यो वृष्टो देवः 1.4.88 and 2.3.10 'It rained round about (but with the exclusion of) Trigarta'. Similarly परि परि सौवीरेभ्यः, परि परि सर्वसेनेभ्यः ॥ Why do we say when meaning exclusion? Observe ओदनं परिषिञ्चति ॥
Vart:- Optionally परि, meaning 'exclusion', is repeated when it occurs not in a compound, as परि परि त्रिगर्त्तेभ्यः or परि त्रिगर्त्तेभ्यः ॥ In a compound, there is no repetition as परित्रिगर्त्तं वृष्टोदेवः, because the word परि has not the meaning of exclusion only here; in fact, the whole compound word denotes here the idea of exclusion, and not the word परि alone.
The word परि is here a Karmapravachaniya 1.4.88, and governs the fifth case by 2.3.11. In परिषिञ्चति the word is an upasarga.,