(aeronautics) Any aerodynamic effects occurring due to a vehicle's body or appendages moving in close proximity to the ground.

Glass having a rough, flat surface produced by abrasion or etching.

A species of pangolin, Smutsia temminckii (syn. Manis temminckii).

(sports) A rule regarding play on a specific field, course, or court. / (idiomatic, usually in the plural) The basic rules or standards; whatever someone must know before proceeding.

(intransitive, especially of an animal, chiefly UK) To escape into a burrow, hole, etc. when being hunted.

Of a person: having extensive knowledge of a subject. / Of an argument, etc.: based on good judgment and solid reasoning.

Any member of the order Carcharhiniformes, the largest order of sharks with over 270 species. / A Greenland shark, Somniosus microcephalus.

Ajuga, a genus of herbaceous flowering plants in the mint family Lamiaceae, with most species native to Europe, Asia, and Africa; also, specifically:

To change one's opinion in a way that contradicts what one has previously held.

simple past tense of break new ground