Wiktionary
vb. (present participle of top up English)
Usage examples of "topping up".
Still numb at the loss of her own baby, when she was not cooking for Rupert's staff, she was always bottle-rearing calves and lambs, or feeding hens and ducks, or Rupert's dogs, or topping up the birdtable, or smuggling forbidden toast and marmalade to Arthur when he hung forlornly out of his chewed-down half-door.
In harbour it involved one range of responsibility, concerned mostly with discipline, topping up stores and ammunition, and the organization of working-parties so as to keep the ship clean and efficient: at sea it took on a more vital quality, closer to the war and with less margin for error.
Event, topping up to take us through to the switchover to the mainland cable.
But he poured it all the same, handing me the glass and topping up his own.
I then performed the operation known as 'topping up' - that is I beamed my energy on to Toby's owner so that she in turn could pass it through her hands to the cat.
Donald began slowly topping up our already full tank, then suddenly turned to face the old man.
So I just put my fist into the first chest and filled all the available pockets of my old shooting-coat and trousers, topping up--this was a happy thought--with a few handfuls of big ones from the third chest.
And you had to admit he did a good job of checking under there, topping up the battery terminals and all.