The 'it' in 'have it in for'

[Haihao]

Thanks again, Mr MikeNewYork. The second has become quite clear to me. By the way, can I understand the little difference for the first as:

1. hit her on the arm: emphasized on 'her', who the person was hit and the part being hit was her arm ?
2. hit her arm: only the part being hit ?

Thank you.

[MikeNewYork]

Thanks again, Mr MikeNewYork. The second has become quite clear to me. By the way, can I understand the little difference for the first as:

1. hit her on the arm: emphasized on 'her', who the person was hit and the part being hit was her arm ?
2. hit her arm: only the part being hit ?

Thank you.

I can accept that.

[Haihao]

Hi Mr. Mike,

Good evening again.

I have some more questions or doubts about 'it' although I realized some of them were of inelegant meanings:

1. hit it off (with)
2. have it off (or away)
3. have it out with

What is the sense or realm of 'it' in the above phrases respectively?

haihao

[MikeNewYork]

Hi Mr. Mike,

Good evening again.

I have some more questions or doubts about 'it' although I realized some of them were of inelegant meanings:

1. hit it off (with)
2. have it off (or away)
3. have it out with

What is the sense or realm of 'it' in the above phrases respectively?

haihao

Hit it off with = get along very well.
Have it off (away) = I have no idea.
have it out with = have an argument with.