noun
supplement; addition; extra amount
Refers to something added to make up a shortage or to supplement an existing amount. Often used in financial or quantitative contexts.
予算が足りないので、足し前を申請した。
Since the budget was insufficient, I applied for a supplement.
材料が少し足りなかったから、足し前を買ってきた。
The ingredients were a little short, so I bought some extra.