One of the mysteries of the English language finally explained.
1Designating the total weight of an aircraft or mass of a spacecraft in flight, including crew, passengers, fuel, and cargo.
2Designating the total weight of any machine, vehicle, structure, etc.
3Betting. Designating a system of betting or series of bets in which the stake and winnings accruing from each bet won are placed on the next bet.
4Designating the total cost of a product, enterprise, etc., or the total of some payment or expenditure; overall.
5Originally and chiefly British. Of a postal service: with all items sent by air, but with no special fee charged for this.
Informal. An all-up weight. Also (originally and chiefly Australian): an all-up cost, payment, or expenditure.
1920s. From all [noun] + up.
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