what is backburner?

[bobby]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #544 "English Slang Idioms (147)", question 3

"I am going to have to put my plans to travel on the .......... until I have more vacation days saved up. I only have six days at the moment and I want to be able to travel for at least two weeks," Jacob told his coworker and best friend.

(a) wish transcript
(b) second objective
(c) backburner
(d) back seats

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #544 "English Slang Idioms (147)", answer 3

"I am going to have to put my plans to travel on the backburner. until I have more vacation days saved up. I only have six days at the moment and I want to be able to travel for at least two weeks," Jacob told his coworker and best friend.

Correct answer: (c) backburner

Your answer was: incorrect
"I am going to have to put my plans to travel on the back seats. until I have more vacation days saved up. I only have six days at the moment and I want to be able to travel for at least two weeks," Jacob told his coworker and best friend.
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dear sir,
Would you explain what is backburner please?
bobby

[Mister Micawber]

.
A backburner is the rearmost cooking element of a kitchen stove. The idiom is 'to put on the backburner', which means 'to postpone'.
.
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Native English teacher at Mister Micawber's