top up

top up (third-person singular simple present tops up, present participle topping up, simple past and past participle topped up)

1. To refill (or recharge) something.

   I shall top up with petrol before the long trip.

   • 2022 February 9, Ben Jones, “Batteries included for future shunters”, in RAIL, number 950, page 56:

     For the CBD90, the primary power source is a 526kW/h lead acid battery driving four traction motors. As well as charging from a three-phase shore supply or regenerative braking, the batteries can be topped up by an EU Stage V-compliant 56kW JCB Ecomax diesel engine if required.

   1. (idiomatic) To add to a credit balance.

      I shall top up the mobile phone at the supermarket.

      Users can top up their wallet balance and start sending and receiving money between mobile phones.

   2. (UK) To refill a drink.

      The waitress topped up my coffee every few minutes.

   3. To add to a number or amount, to bring something up to a certain level.
2. (transitive, intransitive, slang) To have sex (with).

   We had dinner, went back to her place, and started topping up.

• US English (in the sense of refill) top off

• top-up (noun)

• pot up, up top