noun, noun or participle which takes 'suru', intransitive verb
waiting upon; attending; serving
Formal, somewhat literary term for attending or waiting upon a superior, often in a historical or ceremonial context. Can be used as a noun or with する to mean 'to wait upon'.
家臣が主君のそばに伺候する。
The retainer waits upon his lord.
宮中で
Attending at the imperial court required strict etiquette.