Senses
主客 host and guest
The host and the guest together; those present at a social gathering
主客 guest of honor
The most important guest at a banquet or event
主客 subject and object
(literary) The subject and the object; the internal self and the external world
主客 master of ceremonies
(archaic) The person in charge of hosting and receiving guests
主客 Zhuke (official title)
(archaic) An official post responsible for receiving foreign envoys, existing until the late Qing dynasty