refilling; topping up
Refers to the act of adding more liquid to a container that already has some, such as topping up a drink or refilling a pot.
Please top up the tea.
Let's add more water to the pot and simmer it a bit longer.
Common kana-kanji mixed spelling.
Compound of 注ぎ (continuative form of 注ぐ 'to pour') + 足し (continuative form of 足す 'to add').