noun

1. A verbal puzzle, mystery, or other problem of an intellectual nature.

   “Here's a riddle: It's black, and white, and red all over. What is it?”

2. An ancient verbal, poetic, or literary form, in which, rather than a rhyme scheme, there are parallel opposing expressions with a hidden meaning.

Synonyms: brain-teaser, conundrum, enigma

verb

1. To speak ambiguously or enigmatically.

2. To solve, answer, or explicate a riddle or question.

   “Riddle me this.”