The two junior members of the Chinese deputation came at the appointed hour. . . . On entering the door of the marquee they both made an abrupt stop, and resisted all solicitation to advance to chairs that had been prepared for them, until I should first be seated; in this dilemma, Dr. Buchanan, who had visited China, advised me what was to be done; I immediately seized on the foremost, whilst the Doctor himself grappled with the second; thus we soon fixed them in their seats, both parties during the struggle, repeating Chin Chin, Chin Chin, the Chinese term of salutation.
Source: wiktionary