1. to split, burst open (intrs.) AN.i.77 (asaniyā phalantiyā); usually in phrase “muddhā sattadhā phaleyya, as a formula of threat or warning “your (or my) head shall split into 7 pieces,” e.g. DN.i.95; SN.i.50; Snp.983; Ja.i.54; Ja.iv.320 (me); Ja.v.92 (= bhijjetha C.); Mil.157 (satadhā for satta˚); Dhp-a.i.41 (m. te phalatu s.) Vv-a.68; whereas a similar phrase in Snp.988 sq. has adhipāteti (for *adhiphāṭeti = phalati)
   caus phāleti (& phāṭeti)
   pp phalita & phulla.
2. to become ripe, to ripen Vin.ii.108; Ja.iii.251; Pv-a.185.

phal to split, break open = *sphal or *sphaṭ; cp. phāṭeti. On etym. see also Lüders, K.Z. xlii, 198 sq.