(intransitive) To fish for crabs. / (transitive, US, slang) To ruin. / (intransitive) To complain. / (transitive) To complain about.

The crab apple or wild apple. / The tree bearing crab apples, which has a dogbane-like bitter bark with medical use. / A cudgel made of the wood of the crab tree; a crabstick.

(obsolete) To irritate, make surly or sour / To be ill-tempered; to complain or find fault. / (British dialect) To cudgel or beat, as with a crabstick

The tree species Carapa guianensis, native to South America.

(informal) Short for carabiner.

A dry, thin, crispy baked bread (usually salty or savoury, but sometimes sweet, as in the case of graham crackers and animal crackers).

(derogatory) Pseudoscience; activity which appears to be science-like but is not founded on proper scientific methods.

Visibly irritated or annoyed; grouchy, irritable, in a foul mood; given to complaining or finding fault in an annoyed way. / crabbed; difficult, or perplexing.

A small, narrow opening, fissure, crevice, or chink, as in a wall, or other substance. / A tool for forming the necks of bottles, etc.

(intransitive) To break into, or become full of, crannies. / (intransitive) To haunt or enter by crannies.