saṁvattati

to lead (to), to be useful (for) AN.i.54, AN.i.58 (ahitāya dukkhāya); Vin.i.10 = SN.v.421; Iti.71 sq.; Ja.i.97; Pot. saṃvatteyya Vin.i.13
■ Often in phrase nibbidāya, virāgāya… nibbānāya saṃvattati e.g. DN.i.189; DN.ii.251; DN.iii.130; SN.v.80, SN.v.255; AN.iii.83, AN.iii.326.

saṃ + vattati

1. to be evolved, to be in a process of evolution (opp. vivaṭṭati in devolution) DN.i.17 DN.iii.84, DN.iii.109; AN.ii.142; DN-a.i.110.
2. to fall to pieces, to come to an end (like the world’s destruction), to pass away, perish, dissolve (intrs.) Ja.iii.75 (paṭhavī s.; variant reading saṃvaddh˚); Mil.287 (ākāso ˚eyya). For saṃvaṭṭ˚ at Ja.i.189 read saṃvaddh˚.

saṃ + vaṭṭati