を補う

to make up for; to supplement

→ を
phrase Rare #27,533
to make up for; to supplement The particle を marks what is being made up for or supplemented.
JA: 農民はしばしば収入を補うために副業をします。
EN: Farmers often take on side jobs to supplement their income.

美徳は欠点を補うんだよ

Virtue makes up for shortcomings.

— マルコムX (1992)

人の美徳は弱点を補うのさ

A person's virtues make up for their weaknesses.

— マルコムX (1992)

彼女が損失を補うように我々は提案した。

We suggested that she make up for the loss.

彼女が損失を補うようわれわれは要求した。

We demanded that she make up for the loss.