Select the most appropriate meaning of the given idiom.

Go back to the drawing board

start planning again because earlier plans failed

The most appropriate meaning of the idiom "go back to the drawing board" is start planning again because earlier plans failed.

The other options are incorrect.

• "Get started on a new job as the old one wasn't good" does not mean start planning again. Starting a new job means to begin working on a new project or task.
• "Look back at your achievements and learn from them" does not mean start planning again. Looking back at your achievements means to reflect on what you have accomplished and what you can learn from it.
• "Withdraw support to someone whom you always supported" does not mean start planning again. Withdrawing support means to stop helping or encouraging someone.

The idiom "go back to the drawing board" comes from the idea of an architect or engineer starting over when their plans are not working. In the same way, to go back to the drawing board means to start over when your plans are not working. For example, you might say that a company had to go back to the drawing board after their new product launch failed.