Probably from the same as G939 (through the notion of going down; compare G899); weight; in the New Testament {only} figuratively a {load} {abundance} authority: - burden ({-some}) weight.
Act 15:22Then pleased it the apostles and elders, with the whole church, to send chosen men of their own company to Antioch with Paul and Barnabas; namely, Judas surnamed BarsabasG923, and Silas, chief men among the brethren: