All phrasal verbs
along
/əlɔŋ/4 verbsVowel-initial — links backwardsMoving forward in company, or in agreement.
ALONG is accompaniment in motion: come along, bring along, tag along all mean joining someone who is already going.
From that, two figurative senses fall out: get along (two people moving in the same direction, socially) and go along with (agreeing to move in someone else's direction).
What it does to the sound
Unstressed schwa first, stress on LONG: a-LONG. The verb links straight into that schwa, so get along is “ge-da-LONG” with a flapped T and no gap anywhere in the phrase.
What ALONG means
Every verb that takes ALONG
The complete list — 4 of them. The section above groups the common ones by what ALONG is doing.