Jastrow: עָקַב

עָקַב (b. h.; denom. of עָקֵב) 1) to trace, follow. Shebu. 47ᵇ עוֹקֵב אחר ניאף, v. נָאַף. Macc. 10ᵃ (expl. עקבה, Hos. VI, 8) שהיו עוֹקְבִין להרוג וכ׳ they followed up (their victims) to commit murder; Yalk. Hos. 523; Yalk. Josh. 30; Yalk. Num. 787. —2) to go beyond, supersede; (b. h. to supplant). Sot. 16ᵃ בשלשה מקימות הלכה עוֹקֶבֶת מקרא in three instances the practice goes beyond the Biblical text (Ar. Var. עוֹקֶמֶת, עוֹקפֶת). Ib. כי קא חשיב עוקבת ועוקרת וכ׳ he (R. Joh.) counts such cases only where the practice goes beyond and overthrows (the text), whereas in this case עוקבת ומוספת the practice goes beyond and adds to (the text).