斬而不奏

to do sth and not report the fact (idiom)

to behead (as form of capital punishment) / to chop

and / as well as / and so / but (not) / yet (not) / (indicates causal relation) / (indicates change of state) / (indicates contrast)

no; not so / (bound form) not; un-

to play music / to achieve / to present a memorial to the emperor (old)