to commit oneself to a course from which there is no retreat—U.S. politics, 1852—from a military tactic in which an army cuts off its means of retreat by destroying the route by which it might be pursued
USA, 1923: a court in which a perpetrator of a minor offence may sentence themself and their fellow offenders—USA, 1925: a court in which a perpetrator of a minor offence may pay a fixed fine without having to stand trial
something or someone that is unalloyed, throughgoing, trustworthy—USA, 1848—refers to gold with the complete purity of twenty-four parts out of twenty-four
Canada, 1977: pouch-pack milk, as opposed to cartoned milk—UK, 1984: bag-in-box wine (said to be of Australian-English origin, but this is not corroborated)
to create a diversion, in order to avoid a dangerous or unpleasant situation—UK, 1730—alludes to the Preface to A Tale of a Tub (1704), by Jonathan Swift