What does along mean?
The definition of along
A*long”, adv.
Etym: [OE. along, anlong, AS. andlang, along; pref. and- (akin to OFris. ond-, OHG. ant-, Ger. ent-, Goth. and-, anda-, L. ante, Gr. anti, over against) + lang long. See Long.]

1 By the length; in a line with the length; lengthwise. Some laid along . . . on spokes of wheels are hung. Dryden.
2 In a line, or with a progressive motion; onward; forward. We will go along by the king’s highway. Numb. xxi. 22. He struck with his o’ertaking wings, And chased us south along. Coleridge.
3 In company; together. He to England shall along with you. Shak. All along, all trough the course of; during the whole time; throughout. “I have all along declared this to be a neutral paper.” Addison.

— To get along, to get on; to make progress, as in business. “She ‘ll get along in heaven better than you or I.” Mrs. Stowe.

A*long”, prep.
By the length of, as distinguished from across. “Along the lowly lands.” Dryden. The kine . . . went along the highway. 1 Sam. vi. 12.
Etym: [AS. gelang owing to.]

(Now heard only in the prep. phrase along of.) Along of, Along on, often shortened to Long of, prep. phr., owing to; on account of. [Obs. or Low. Eng.] “On me is not along thin evil fare.” Chaucer. “And all this is long of you.” Shak. “This increase of price is all along of the foreigners.” London Punch.