Select the most appropriate meaning of the given idiom.

By the skin of one’s teeth

By a very narrow margin

The most appropriate meaning of the given idiom "by the skin of one's teeth" is by a very narrow margin.

The other options are incorrect.

• With the help of someone does not mean by a very narrow margin. With the help of someone means that you were able to achieve something because someone helped you.
• By a very big margin means that you achieved something by a large amount.
• Without anyone's help does not mean by a very narrow margin. Without anyone's help means that you achieved something without any help from anyone.

The idiom "by the skin of one's teeth" comes from the idea of a person being able to escape from a dangerous situation by only the smallest of margins. In the same way, to achieve something by the skin of one's teeth means to achieve it by only the smallest of margins. For example, you might say that a team won a game by the skin of their teeth.