without using the brain

big head(play the peacock; think no small beer of oneself; self-conceited; lump large)

overweening(be terribly conceited; assume airs of selfimportance; stand upon one's pantofles)

as precarious as a pile of eggs

save the Zhao by besieging the capital of the Wei

idealism

penetrate everywhere

a makeshift to tide over a present difficulty

never blot a line in writing(have a facile with unimprovable style)

be a nothing

take the words too literally

expect one's son to be talent(hope one's son will turn out a dragon)

play on words

draw timidly back

political and military achievements (idiom)​

stir up trouble

not matter much

(wish somebody) a long life

be of no account

completely discredited