the original idiom means "some one fears the wolf in front of him, while fears the tiger behind him" (I don't think it make sense to you)
the basic idea of the idiom is "someone fears any results of the decision he's going to make"
For example: "when one wants to decide whether he's going to change his job, and he fears that he may not be able to find another job if he quit the current job, on the other hand, he fears that a better job oppotunity will be lost if he doesn't quit.", so he's hesitant, and fears the both results from the two decisions.
Thank you in advance!
Top answer
He is on the horns of a dilemma ? He's caught between the Devil and the deep blue sea ? He's between a rock and a hard place ?
— Mister Micawber
He is on the horns of a dilemma ?
He's caught between the Devil and the deep blue sea ?
He's between a rock and a hard place ?
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----- The phrase between Scylla and Charybdis has come to mean being in a state where one is between two dangers and moving away from one will cause you to be in danger from the other.