{n. phr.} A very complicated and difficult problem to solve. * /Doing one's income tax properly can present a knotty problem./
KNOTTY PROBLEM
Meaning of KNOTTY PROBLEM in English
Dictionary of English idioms . Словарь английских идиом. 2012
{n. phr.} A very complicated and difficult problem to solve. * /Doing one's income tax properly can present a knotty problem./
Dictionary of English idioms . Словарь английских идиом. 2012