siniyhati

(to be moist or sticky, fig.) to feel love, to be attached Vism.317 = Dhs-a.192 (in defn of mettā). Caus. sineheti (sneheti, snehayati) to lubricate, make oily or tender (through purgatives etc.) Vin.i.279 (kāyaṃ); Mil.172; DN-a.i.217 (temeti +); to make pliable, to soften Mil.139 (mānasaṃ)
pp siniddha.

Vedic snihyate, snih; cp. Av. snāēƶaiti it snows = Lat. ninguit, Gr. νείγει; Oir. snigid it rains; Lat. nix snow = Gr. νίγα = Goth, snaiws, Ohg. sneo = snow; Oir snige rain; etc
■ The Dhtp.463 gives the 2 forms sinih & snih; in meaning pīṇana. Cp. sineha