noun
emperor's teacher; imperial army
Historical term. The 'teacher' sense refers to a mentor or advisor to the emperor. The 'army' sense refers to the military forces under direct imperial command. Both are primarily encountered in historical or literary contexts.
王師は幼い天皇に学問を教えた。
The imperial teacher instructed the young emperor in his studies.
王師が反乱軍を鎮圧するために出陣した。
The imperial army set out to suppress the rebel forces.