Select the most appropriate meaning of the given idiom.

Get on like a house on fire

Get on extremely well with someone

The most appropriate meaning of the idiom "get on like a house on fire" is get on extremely well with someone. It is used to describe two people who seem to have a natural rapport and enjoy each other's company. The idiom comes from the idea of two people who are so compatible that they get along like a house on fire.

The other options are not correct.

• Like someone immediately: This can be part of getting on like a house on fire, but it is not the whole meaning.
• Feel a lot of affection for one particular person, often without knowing why: This is not the same as getting on like a house on fire.
• Do something good for someone you have done something bad to in the past: This is not the same as getting on like a house on fire.