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

Note: 
The expression does not correlate in meaning with the
phrase on your bike—(UK) used to rudely tell a person to go
away (and stop being annoying ): There’s nothing for you here,
mate. On your bike, then.
get off one’s high horse • get off one’s soap box
get off one’s high horse —(coll.) stop behaving arrogant or
superior: He does need to get off his high horse and rid himself
of the belief that he is going to save the world.
get off one’s soap box —stop speaking out in an irritatingly
overbearing way: You really need to get off your soap box.
Every comment you make you have to add your egotistical
attitude into it.
get off the ground • touch ground
get off the ground—(of a project, scheme, etc.) make a suc-
cessful start: The project never got off the ground because of
red tape and lack of organization.
touch ground —get to reality: Now we are really beginning
to touch ground. Tell us exactly how much you can put into
the enterprise.
get on like a house on fire • go like a house on fire
get on like a house on fire —(also: get along like a house on fire)
become good friends in a very short time: “How are your new
neighbors?” “Pretty well, their sons and ours get on like a
house on fire.”
go like a house on fire —
1
. (of an event, activity, etc.) be very
successful: All the families were gathered around and the cer-
emony and reception went like a house on fire. 2. is used to
refer to some fast action: Time was precious, so … I would
go like a house on fire trying to say as much as I could before
my time was up.
get on one’s high horse • get on one’s horse
get on one’s high horse —(also: ride one’s high horse) become
dignified and formal; assume an arrogant mien: As soon as I
said a little slang to her she got on her high horse.
get on one’s horse —(sl.) hurry; start at once: You better get
on your horse if you’re going to make that plane.