Select the most appropriate meaning of the given idiom.

Back out

To withdraw

The most appropriate meaning of the given idiom "back out" is (2) To withdraw.

The idiom "back out" means to withdraw from something that you have agreed to do. It is often used to describe someone who is afraid to do something or who is not committed to something.

The other options do not fit the meaning of the idiom.

• To enquire means to ask for information.
• To throw means to propel something through the air with force.
• To explode means to suddenly burst or break apart with great force.