anything that spoils or obstructs, a minor stain, impurity, defilement, depravity, Vin.ii.295 (cp. Snp-a.487 & Vv-a.134 & see abbha); MN.i.36, MN.i.91; DN.iii.42 sq., DN.iii.49 sq., DN.iii.201; SN.v.92 sq. (pañca cittassa upakkilesā), SN.v.108, SN.v.115; AN.i.10 (āgantuka), AN.i.207 (cittassa), AN.i.253 (oḷārika etc.); AN.ii.53 (candima-suriyānaṃ samaṇa-brāhmaṇānaṃ), AN.ii.67; AN.iii.16 (jātarūpassa, cittassa), AN.iii.386 sq.; AN.iv.177 (vigatā); AN.v.195; Pts.i.164 (eighteen); Pp.60; Dhs.1059 Dhs.1136; Ne.86 sq., Ne.94, Ne.114 sq.; Sdhp.216, Sdhp.225 (as upaklesa). Ten stains at Vism.633.
fr. upa + kliś