By and by and Behind

By and by adverb - At or within a short time.

Behind and by and by are semantically related. in event topic. In some cases you can use "Behind" instead an adverb phrase "By and by", when it comes to topics like order, later, afterward, happening after.

Behind adverb - In or to or toward the rear.

By and by and behind are semantically related. Sometimes you can use "By and by" instead an adverb "Behind".