不堪一击

to be unable to withstand a single blow / to collapse at the first blow

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

cannot bear / cannot stand / utterly / extremely

to endure / may / can

one / single / a (article) / as soon as / entire; whole; all; throughout / "one" radical in Chinese characters (Kangxi radical 1) / also pr. [yao1] for greater clarity when spelling out numbers digit by digit

to hit / to strike / to break / Taiwan pr. [ji2]