A dictionary of Confusable Phrases: More Than 10,000 Idioms and Collocations

Note: 
The expression does not correlate in meaning with the
phrase be on the horse—(Drug users) be under the effects of or
addicted to heroin: How long have you been on the horse?
get on the bandwagon • go on the wagon
get on the bandwagon —join in what seems likely to be a
successful enterprise (in the hope of a personal gain): Once it
was clear that he would be elected, all the uncommitted politi-
cians tried to get on the bandwagon.
go on the wagon —intend not to drink any alcohol at all:
Carter says that he is really serious this time about going on
the wagon.
get on to something • get on towards something
get on to something —
1
. get in touch with an office, etc.,
especially by telephone: I must get on to the shop about the
order that we’ve been waiting for. 2. begin to talk about smth.:
Do not dwell too much on small-talk; get on to the subject
of your job search fairly quickly. 3. begin to understand smth.:
Although at first shorthand seemed difficult to me, I soon got
on to it. 4. (Progressive Tense) be advancing towards a certain
age, time, etc.: It was getting on to evening and the sun was
setting over the water.
get on towards something — = get on to something 4: It was
get it on
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getting on towards evening and I think everyone was anxious
to head for home.
get on with it • get with it
get on with it—continue with what one is doing: My partner
is drinking too much but every time I mention it we end up
arguing — should I just let him get on with it?
get with it—(coll.) respond to new ideas, styles, etc.; become
modern: My wish to you, especially the older dairy farmers,
is to get with it or the future will be without you.