頂補

to fill a vacancy / to substitute for

apex / crown of the head / top / roof / most / to carry on the head / to push to the top / to go against / to replace / to substitute / to be subjected to (an aerial bombing, hailstorm etc) / (slang) to "bump" a forum thread to raise its profile / classifier for headwear, hats, veils etc

to repair / to patch / to mend / to make up for / to fill (a vacancy) / to supplement