UNDERMINE: to make someone less confident, less powerful, or less likely to succeed, or to make something weaker, often gradually.
1.Submerge: to go below or make something go below the surface of the sea or a river or lake.
2.Supersede: to replace something ,especially older or more old-fashioned.
3.Overhaul: ro repair or improve something so that every part of it works as it should.
4.Under grid:under the bars
5.Intersperse: to mix one thing in with another in a way that is not regular.
The third one is the opposite meaning.