Bridge mode is a network configuration that allows a device to pass network traffic through to another router or network device without performing its own routing or NAT.
For example, a router connected to a MikroTik can be placed in bridge mode so the MikroTik handles routing, DHCP and other network functions. The Centipid discussion refers to using bridge mode when connecting a MikroTik to another router or network device.
Related terms: Bridge, NAT, Double NAT, Router, DHCP, WAN, LAN, Access Point, MikroTik