Extended Strong's Greek Lexicon (Abbott-Smith based)
to rot
Usage: σήπω [in LXX; Psa.38:5 (מָקַק ni.), Job.33:21 (כָּלָה) Job.40:7, Sir.14:19, al. ;] to make corrupt: 2 pf. act, with mid, sense (see M, Pr., 154), σέσηπεν, has perished, become corrupted, Jas.5:2.† (AS)