also brain-teaser
(~s)
A ~ is a question, problem, or puzzle that is difficult to answer or solve, but is not serious or important.
= puzzle
N-COUNT
also brain-teaser
(~s)
A ~ is a question, problem, or puzzle that is difficult to answer or solve, but is not serious or important.
= puzzle
N-COUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012