(transitive) To cover with, or as if with, a helmet.

(idiomatic, basketball) The NCAA strategy of playing a suffocating full-court press and aggressive offense for the entirety of a game.

The practice of bettering oneself without relying on the assistance of others. / (law) An act of redressing or preventing a wrong by one's own actions rather than through legal proceedings.

(astronomy) Having the sun at the center/centre; usually in reference to a solar system or orbit. [from 17th c.]

A secondary structure found in many proteins, in which the amino acids are arranged in a coil, or helix, with almost no free space on the inside and all side chains being pointed towards the outside

(nautical) The tiller (or, in a large ship, the wheel) which is used to control the rudder of a marine vessel; also, the entire steering apparatus of a vessel.

(nautical) To control the helm (noun sense 1) of (a marine vessel); to be in charge of steering (a vessel). / (figuratively) To direct or lead (a project, etc.); to manage (an organization).

(archaic or poetic) A helmet. / (heraldry) Synonym of helmet (“the feature above a shield on a coat of arms”) / (Northern England) A shelter for cattle or other farm animals; a hemmel, a shed.

(obsolete); (transitive, archaic or poetic) To cover (a head) with a helmet; to provide (someone) with a helmet; to helmet.

(countable) A stalk of corn, or (uncountable) stalks of corn collectively (that is, straw), especially when bundled together or laid out straight to be used for thatching roofs.