Riddle Very Common

a difficult problem

"The math teacher handed out a riddle that stumped half the class for twenty minutes."

a coarse sieve (as for gravel)

"The construction worker used an old riddle to separate the sharp rocks from the sand before pouring the concrete foundation."

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

"The heavy velvet riddle hung across the window, blocking out the morning light."

A sieve with coarse meshes, usually of wire, for separating coarser materials from finer, as chaff from grain, cinders from ashes, or gravel from sand.

A curtain; bed-curtain

pierce with many holes

"The bullets riddled his body"

set a difficult problem or riddle

"riddle me a riddle"

separate with a riddle, as grain from chaff

"The old winnower used the breeze to help her separate the wheat from the chaff by letting it blow through the riddle."

spread or diffuse through

"An atmosphere of distrust has permeated this administration"

"music penetrated the entire building"

"His campaign was riddled with accusations and personal attacks"

speak in riddles

"The detective sighed when his partner kept speaking in riddles about the suspect's whereabouts instead of giving a straight answer."

explain a riddle

"After everyone guessed wrong, I finally explained the riddle by pointing out that the answer was hidden in the first letter of each line."

To speak ambiguously or enigmatically.

"She sat by the fire and carefully riddled her long hair into two thick braids before bed."

To put something through a riddle or sieve, to sieve, to sift.

To plait

A surname​.

"My neighbor, Mr. Riddle, always fixes our fence before breakfast."