ἐμπονέω

A. work on, [τῇ γῇ] Alciphr. 3.25, cf. JHS 33.338 (Macedonia, ii A.D.).
II. c. acc., elaborate, θεωρίαν Gal. 4.760.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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