(idiomatic) Having difficulty hearing; somewhat deaf.

(computing) To build absolute and unchangeable values into a program such that they can only be changed by modifying the source code.

(vulgar, slang) Tough, uncompromising and inflexible.

(vulgar, slang) A tough and combative person.

(computing) A device used for storing large amounts of data for a computer that persist while the computer is turned off.

(American football) The situation where the quarterback attempts to draw the defense offside through a deceptive snap count sequence, sometimes accompanied by subtle body movements which simulate the initiation of the play.

(US) An alcoholic beverage formed by fermenting cider (apple juice).

(of a boiled egg) Cooked to a solid consistency. / (of a person, especially a detective) Callous and unsentimental.

simple past tense and past participle of hard-boil

(chemistry) Water with a high concentration of dissolved minerals, especially calcium, making it difficult to lather with soap.