firmness, strength / stability, security

firm, strong / stable, secure

get stuck, get jammed

support / hold in check / provide for, maintain, support

that which is constructed to connect two points for the purpose of transportation: a bridge / a bridge-like walkway or corridor between two buildings in a manor, palace, castle, or similar structure

bridge

内戦: civil war / 内線: phone extension

専用: the exclusive use, dedicated

占断: decision by divination; complete possession or occupation / 専断, 擅断: an arbitrary decision

遷都: relocate of the capital