Select the most appropriate meaning of the given idiom.

Too close to call

A very narrow margin

The most appropriate meaning of the idiom "too close to call" is a very narrow margin.

This idiom is used to describe a situation where the outcome is so close that it is difficult to determine who or what is ahead. It is often used in the context of elections, sporting events, and other competitions.

The other options for the meaning of the idiom are not as accurate.

• Huddled together does not typically describe a situation where the outcome is close.
• Very close to heart means something that is important to someone.
• Winning a competition is not the same as having a very narrow margin.