What are idioms?

[Idi]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #519 "English Slang Idioms (103)", question 2

"Matt, originally, when I asked you to help me move into New Jersey, I told you there would be five others that would also help. They all cancelled and I know you are having problems with your shoulder so if you can't make it, I understand." "Jim, I told you I would come and I will. That is too bad about the others but in for a ........., in for a pound I guess."

(a) shilling
(b) ounce
(c) penny
(d) gram

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #519 "English Slang Idioms (103)", answer 2

"Matt, originally, when I asked you to help me move into New Jersey, I told you there would be five others that would also help. They all cancelled and I know you are having problems with your shoulder so if you can't make it, I understand." "Jim, I told you I would come and I will. That is too bad about the others but in for a penny, in for a pound I guess."

Correct answer: (c) penny
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What exactly is the meaning of idioms?

[Linda]

In for a penny, in for a pound means: you are going to put all of your effort into somethng because you've come this far already - you've already put a lot of work into something so you are going to see it through to the end.
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