having a high centre of gravity, and liable to topple / (of an organization) having an excessive number of administrators or managers

The upper deck of a double-decker bus.

the typescript of a document that has carbon copies underneath

The highest gear that is available in a motor vehicle or car.

A man's formal hat, with a tall cylindrical crown (often of silk). / (construction) A kind of steel batten.

to refill (or recharge) something / (UK) to refill the drink of (somebody) / (idiomatic) to extend the credit of something / to add to a number or amount, to bring something up to a certain level

Channel Island milk.

That serves as an addition

An addition. / A serving of drink used to top up an existing glass. / (insurance) An additional premium paid over the initial premium in order to increase benefit values.

(chiefly US, idiomatic) The maximum amount of money that an item, service, or worker is worth; a very high price.