plural of quarter crack

Used other than figuratively or idiomatically: see hard, nut, crack. / (idiomatic) A problem that is challenging to solve.

plural of hard nut to crack

Alternative form of hard nut to crack

To pull or push one's fingers so that the joints make a cracking noise.

plural of tough nut to crack

(idiomatic) To escape notice or lack sufficient attention.

(informal) A beauty treatment for men in which hair is removed from the back, from between the buttocks ("crack") and from the scrotum ("sack").

(idiomatic) To be missed; to escape the necessary notice or attention.

(idiomatic) A problem that is challenging to solve. / (idiomatic, by extension) A situation, person, group, etc. which is difficult to deal with.