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.

(transitive) To calculate the sum of a number of numbers or quantities. / (intransitive, usually with to) To add up (to).

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

(UK, Australia, New Zealand) a traffic jam

(informal) To divide up: to divide, particularly into separate shares for distribution.

(idiomatic, Britain, vulgar) Something which becomes muddled or botched in some way.

The end or conclusion of something. / A punch line of a joke or comedy routine.

(of a machine) Needing to be wound up in order to function.

(idiomatic) Open, honest; tending to disclose information; truthful.