present participle of top up

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.

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

Third-person singular simple present indicative form of top up

simple past tense and past participle of top up

plural of top-up