Fall back and Pull in

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

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

Pull in verb - To keep from exceeding a desirable degree or level (as of expression).

Fall back and pull in are semantically related. Sometimes you can use "Fall back" instead a verb "Pull in".