TBESG:ἀνθυπατεύωto act as proconsulG:V ἀνθ-υπατεύω (see next word), to be proconsul: Act.18:12 Rec. (see: ἀνθύπατος).† (AS)
ἀνθύπατος anthupatos anth-oo'-pat-os From G473 and a superlative of G5228; instead of the highest officer, that is, (specifically) a Roman proconsulKJV Usage: deputy.