This is the 9803rd most frequent Japanese word.
補修
"補修" means "repair" or "maintenance."
In this sentence, '補修' refers to the process of restoring or repairing the structure of the old bridge.
古い橋の補修工事が始まりました。
The repair work on the old bridge has started.
Here, '補修' is used to describe the action of fixing an item for reuse, specifically shoes.
靴を補修してまた使えるようにしました。
I repaired the shoes so that they could be used again.
In this occurrence, '補修' implies supplementary or remedial instruction to overcome gaps in knowledge or skills.