Fall back and Roll back

Fall back verb - To move back or away (as from something difficult, dangerous, or disagreeable).

Roll back and fall back are semantically related In some cases you can use "Roll back" instead a verb "Fall back".

Roll back verb - To put an end to by formal action.

Fall back and roll back are semantically related in return to earlier way of doing things topic. Sometimes you can use "Fall back" instead a verb "Roll back".