From G1223 and G4231; to thoroughly occupy {oneself} that {is} (transitively and by implication) to earn in business: - gain by trading.
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Matrix
Luk 9:7¶ Now Herod the tetrarch heard of all that was done by him: and he was perplexedG1280, because that it was said of some, that John was risen from the dead;
Act 5:24Now when the high priest and the captain of the temple and the chief priests heard these things, they doubtedG1280 of them whereunto this would grow.
Act 10:17Now while Peter doubtedG1280 in himself what this vision which he had seen should mean, behold, the men which were sent from Cornelius had made enquiry for Simon's house, and stood before the gate,