Select the most appropriate meaning of the given idiom.

Elbow grease

Hard physical efforts

The most appropriate meaning of the idiom "elbow grease" is >Hard physical efforts.<

The idiom "elbow grease" refers to the physical effort that is required to do something, especially something that is difficult or requires a lot of work. It is often used to describe the effort that is required to clean something, to fix something, or to complete a task.

The other options are not correct.

• Psychological pressure does not refer to hard physical efforts.
• Relational difference does not refer to hard physical efforts.
• Mental disturbance does not refer to hard physical efforts.