1) to be a retailer, to peddle
2) to make money by selling anything
2a) to get sordid gain by dealing in anything, to do a thing for base gain
2b) to trade in the word of God
2b1) to try to get base gain by teaching divine truth
2c) to corrupt, to adulterate
2c1) peddlers were in the habit of adulterating their commodities for the sake of gain