(tennis, golf) Winning all four major championships (a grand slam) plus an Olympic gold medal.

(mineralogy) A rock formed by contact metamorphism of carbonaceous shale, characterized by prominent cleavage or schistosity and the presence of conspicuous chiastolite crystals in a fine-grained groundmass.

having flat sides / (US, colloquial) tall, or long and lank

(UK) A cheap fuel consisting of slack (coal dust) and small lumps of coal (nuts); unlike other solid fuel it was not rationed during the period after World War II.

(UK, rail transport) Applied to an older kind of passenger train with heavy doors, opened from the inside by reaching out of the window to the handle on the outside.

(transitive, dated) To consume carelessly or wastefully; to waste.

plural of slap chip

(South Africa, chiefly in the plural) A french fry.

plural of slam piece

(informal) A journalistic or other treatment which portrays its subject in a highly unfavorable manner. / (slang) A sexual partner to whom one has no particular emotional attachment.