top-up

See also: topup and top up

English

top-up (not comparable)

That serves as an addition
English university students will have to pay top-up fees.

additional

top-up (countable and uncountable, plural top-ups)

An addition.
- 2013, Melissa Hogenboom, “Applicants wanted for a one-way ticket to Mars”, in BBC News:
  Energy will be generated from solar panels, water will be recycled and extracted from soil and the astronauts will grow their own food - they will also have an emergency ration and regular top-ups as new explorers join every two years.
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.
Additional credit purchased for a mobile phone.
I added a $20 top-up on my cellphone's data plan.
(medicine) A dose of epidural anesthetic added to previously injected spinal anesthetic in combined spinal-epidural anesthesia
- 1999, The Epidural “Top-Up” in Combined Spinal-Epidural Anesthesia: The Effect of Volume Versus Dose‎^[1]:
  The reinforcement of anesthesia by an epidural “top-up” in combined spinal-epidural anesthesia may be explained by a dual mechanism: a volume effect compressing the dural sac and a local anesthetic effect.
(education) The situation where a student who holds a qualification equivalent to part of a degree course is then accepted onto a degree course at an intermediate point, without having to start it from the beginning.

additional credit purchased for a mobile phone