godan verb (-u), transitive verb
supplement; make up for; compensate for; cover (a shortage); fill (a vacancy)
Broadly used for adding something to make up for a lack, deficiency, or shortfall. Can be concrete (money, supplies) or abstract (ability, effort).
足りない分は貯金で補った。
I made up the shortfall with my savings.
経験不足を努力で補う。
I compensate for my lack of experience with hard work.
欠員をアルバイトで補う。
We fill the vacancy with part-time workers.