top up

top up

1. To fill some container or vessel with more of something. A noun or pronoun can be used between "top" and "up." Often used without directly stating the thing being filled, with the person or thing it belongs to being mentioned instead. Oh, you're glass is nearly empty, Tom. Let me top you up. Would you bring this bottle of wine to the table and top up everyone's glass, please? Make sure you top the car up with gas before you set out.
2. To add more money to some account. With our pay-as-you-go cell phone plans, you can top up over the phone or at various stores around the country. Don't forget to top up your account regularly, as payments are taken from it automatically.
3. To supplement one's income. A noun or pronoun can be used between "top" and "up." I do a bit of freelance work in the evenings to top up what I earn each month. You'll be on a lower starting wage, but you can top it up with commissions.
See also: top, up
Farlex Dictionary of Idioms.

top something up

to add a bit of something to replenish the amount that was used. Let me top your drink up. Can I top up your glass?
See also: top, up
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

top up

v. Chiefly British
1. To fill some container completely, especially when it is almost full to begin with: Can I top up your coffee? I topped the fish tank up with fresh water.
2. To supplement some income: She tops up her salary with odd jobs on the side. He relies on book royalties to top his salary up.
See also: top, up
The American Heritage® Dictionary of Phrasal Verbs.
See also:
  • empty in(to) (something)
  • empty into
  • enlist in
  • enlist in (something)
  • count in
  • (Is) this taken?
  • batten
  • batten down
  • copy out
  • copy out (by hand)
References in periodicals archive
Presently the merchants are paying farmers the minimum Grade D price of US$0.85/kg and have promised that, depending on the results of grading, they would pay top ups.
Children from well-off families could get an initial sum of pounds 250, with top ups of pounds 50 for a total of pounds 400.
The margin on the most popular EUR10 and EUR15 top ups was also cut by one per cent to 8.5 per cent.
The lobby group has written to the company saying the majority of members would stop selling the top ups if the reduced margins are pushed through.
Paypoint, a UK company that offers instant electronic top ups for mobile phones, has implemented Mosaic Software's Postilion electronic funds transfer transaction platform.
Polfon, which was recently established by US-based Alpha Group Corp, will use Postilion to control and supply a database of pre-paid mobile phone vouchers and online pre-paid top ups to which Polish mobile operators will have access.