齊放

broadside / simultaneous fired cannonade

(name of states and dynasties at several different periods) / surname Qi

neat / even / level with / identical / simultaneous / all together / to even sth out

to put / to place / to release / to free / to let go / to let out / to set off (fireworks)

a hundred flowers bloom (idiom); let the arts have free expression

a hundred flowers bloom, a hundred schools of thought contend (idiom); refers to the classical philosophic schools of the Warring States period 475-221 BC, but adopted for Mao's campaign of 1956