συνεπινεύω
From LSJ
English (LSJ)
A join in assenting, Arist.SE169a33, IPE2.52 (Panticapaeum, i A.D.), Wilcken Chr.14 ii 13 (i A.D.), Plu.2.53b; ἐξ ὅλης τῆς ψυχῆς ταῖς ἡδοναῖς σ. ib.446a. 2 c. acc., join in granting, τίμαις (Aeol. acc. pl.) IGRom.4.1302.20 (Cyme, i B.C./i A.D.). II literally, of an orator's gestures in accordance with his speech, Phld.Rh.1.73S.