Top-up

Full definition of top-up

Adjective

1. That serves as an additionEnglish university students will have to pay top-up fees.

Noun

1. An addition.
• 2013, BBC News, by Melissa Hogenboom, Applicants wanted for a one-way ticket to MarsEnergy 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.
2. Additional credit purchased for a mobile phone.
3. (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 DoseThe 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.

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