Making something stronger or more robust by reinforcing weak or insufficient parts; strengthening or reinforcement (often used as 補強する).
古い建物の耐震補強を行った。
We carried out seismic reinforcement on the old building.
チームはシーズン中に守備力を補強するために選手を獲得した。
The team signed a player during the season to reinforce its defense.
棚がぐらつくので、金具で補強した。
The shelf was wobbling, so I reinforced it with brackets.