fast
fast and furious lively and exciting.
2000Independent We understand that the bidding was fast and furious right up to the last minute.
hard and fast: seehard.
make a fast buck: seebuck.
play fast and loose ignore your obligations; be unreliable.
☞ Fast and loose was the name of an old fairground game, in which a punter was challenged to pin an intricately folded belt, garter, or other piece of material to a surface. The person running the game would inevitably show that the item had not been securely fastened or made 'fast', and so the punter would lose their money. The phrase came to be used to indicate inconstancy.
2013Daily Telegraph It seems the First Minister has been playing fast and loose with the facts on EU entry and has been spectacularly caught out.
in the fast lane where life is exciting or highly pressured.
pull a fast one try to gain an unfair advantage by rapid action of some sort. informal
☞ This phrase was originally early-20th-century US slang and is also found as put over a fast one.
2012Bryan Caplan, Arnold Kling & David HendersonLibrary of Economics & Liberty The Chinese negotiator that got the British to take Hong Kong thought he'd pulled a fast one precisely because it was pretty much a barren island at the time.
thick and fast: seethick.