Do you mean neutralizing?
Neutralizing means getting rid of the "bad"/"hurting"/"unwanted(sometimes wanted though)" part of something, for example neutralizing hydrocloric acid means you put a base in it, the base has to have to same amount of OH-ions as there is H+-ions. The acid will then turn into H2O(water) and NaCl(salt).
You can neutralize an acid by putting a metal in it too.
Mg(magnesium) + HCl(hydrocloric acid) → MgCl(salt).