godan verb (-u)
complement each other; make up for each other's shortcomings
Describes a mutual relationship where two or more people or things compensate for each other's weaknesses or deficiencies, often in a positive, collaborative sense.
彼らはお互いの弱点を補い合う良いチームだ。
They are a good team that complements each other's weaknesses.
この二つの技
These two technologies complement each other to create a more powerful system.