1
general::
Will come, will arrive, as in John said he'd be along in a few minutes, or The doctor's report will be along by the end of the week. This phrase always indicates a future event. [Colloquial; early 1800s], In addition to the idioms beginning with ALONG, Also see ALL ALONG; ALL ALONG THE LINE; BE ALONG; COME ALONG; FOLLOW ALONG; GET ALONG; GO ALONG; PLAY ALONG; RUN ALONG; STRING ALONG.
American Heritage Idioms