What is a fall guy?

[Ondly]

English Language Tests, Intermediate level

ESL/EFL Test #465 "English Slang Idioms (207)", question 6

"I am not going to put my name on this contract. I know that you are going to try to defraud the other party and I am not going to be the ......... guy for your scheme. I am not going to ruin my reputation for your benefit," Max said to Frank at work.

(a) chop
(b) lame
(c) single
(d) fall

English Language Tests, Intermediate level

ESL/EFL Test #465 "English Slang Idioms (207)", answer 6

"I am not going to put my name on this contract. I know that you are going to try to defraud the other party and I am not going to be the fall guy for your scheme. I am not going to ruin my reputation for your benefit," Max said to Frank at work.

Correct answer: (d) fall
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sthick to ones colours, is an idiom i want to know only the meaning of this idiom not word by word i want together.
thanks

[Mister Micawber]

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Please supply a context sentence.
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Native English teacher at Mister Micawber's

[Petsonofgod]

Fall guy means Victim or scapegoat.

Fall guy will be blamed for others mistakes.