Select the most appropriate meaning of the given idiom.

To walk the tight rope

Be very cautious

The most appropriate meaning of the given idiom "to walk the tightrope" is to be very cautious.

It is used to describe a situation where someone is in a difficult or dangerous situation and needs to be very careful. The idiom is thought to have originated from the idea of walking a tightrope, which is a very dangerous activity that requires a lot of caution.

For example, you might say "The politician is walking a tightrope by trying to please both sides of the issue." This means that the politician is in a difficult situation and needs to be very careful about what they say or do.

The other options are not accurate descriptions of the meaning of the idiom.

• Be an expert: This does not mean to be cautious.
• Be well trained: This does not mean to be cautious.
• Be very nervous: This is not the opposite of being cautious.