(literally) With a single blow, effort, or act. / (figuratively, by extension) At once, immediately; in an instant.

(slang, vulgar) Uselessly superfluous.

Occupied with a given activity; busy with something. / Engaged in sexual intercourse or other sexual activity.

Present participle of go at it.

A rare neurodegenerative inherited disease causing severe disability, characterized by poor coordination and telangiectasia to small dilated blood vessels.

(chiefly US and Canada, idiomatic) An attempt or an opportunity.

(chiefly US and Canada, idiomatic) To make an attempt; to try.

Used other than figuratively or idiomatically: see film, at, 11. / (historical) the video footage of a breaking news story will be screened later that evening.

To spew saliva as froth. / (figuratively) To rage, to vent one's anger.

To live on the best at another's expense.