不费吹灰之力' 不费吹灰之力[-費----] bụ̀ fèi chuīhuīzhīlì {E} f.e. not needing the slightest effort'
吹灰' 吹灰 chuīhuī v.o. blow away dust' 吹灰之力' 吹灰之力 chuīhuīzhīlì {E} n. just a small effort | Tā bụ̀ fèi ∼ jiù bǎ wèntí jiějué le. 他不费∼就把问题解决了。 He solved the problem without the slightest effort.'