parihāyati

to decay, dwindle or waste away, come to ruin; to decrease, fall away from, lack; to be inferior, deteriorate Vin.i.5; MN.iii.46 sq. (opp. abhivaḍḍhati); SN.i.120, SN.i.137; SN.iii.125; SN.iv.76 sq.; AN.iii.252; Dhp.364; Snp.767; Ja.ii.197; Ja.iv.108; Mnd.5 (paridhaṃsati + Mil.249 (id.); Pp.12 (read ˚hāyeyya for ˚hāreyya) Snp-a.167 (+ vinassati); Pp-a 181 (nassati +); Pv-a.5 Pv-a.76 (variant reading), Pv-a.125 (˚hāyeyyuṃ)
pp parihīna, Pass. parihiyyati, Caus. parihāpeti (q.v.).

pari +