Highly trained and competent. / Excellent, first-rate, superior, top-notch.

(obsolete) One who excels; the best.

A thin and usually jagged space opened in a previously solid material. / A narrow opening. / A sharply humorous comment; a wisecrack.

(intransitive) To form cracks. / (intransitive) To break apart under force, stress, or pressure. / (intransitive) To become debilitated by psychological pressure.

(intransitive, idiomatic, often with 'with') To continue at a task briskly or promptly. / To continue apace. / (transitive, dated) To put on.

Obsolete form of crack.

Broken so that cracks appear on, or under, the surface. / Broken into coarse pieces. / (of a voice) Harsh or dissonant. / (slang) Extremely good at something (usually a video game).

simple past tense and past participle of crack

present participle of crack

(Britain) Very, usually associated with praise.