Backslide and Drop down

Backslide verb - Drop to a lower level, as in one's morals or standards.

Drop down and backslide are semantically related In some cases you can use "Drop down" instead a verb "Backslide".

Drop down verb - Fall or descend to a lower place or level.

Backslide and drop down are semantically related in descend topic. Sometimes you can use "Backslide" instead a verb "Drop down".