Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
rib [rɪb] n (ANAT) ребро́#
vt (inf)(mock) подшу́чивать (подшути́ть*perf) над +instr
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.