noun (common) (futsuumeishi)noun or participle which takes the aux. verb surutransitive verbcovering (a loss, deficit, etc.);making up (for);compensating (for);supplementation
債券発行による調達資金は予算の赤字を補填するのに使われる。
The proceeds from the bond issue will be used to finance the budget deficit.
Other forms
補てん 【ほてん】 · 補塡 【ほてん】 (rarely used kanji form)