Select the most appropriate meaning of the given idiom.

Know like the back of one’s hand

to have detailed knowledge of something

The most appropriate meaning of the idiom "know like the back of one’s hand" is to have detailed knowledge of something. It is an informal expression that means to be very familiar with something, such that you know it inside and out. The idiom is thought to have originated in the 17th century, and it is believed to be a reference to the fact that people often touch the back of their hands frequently, so they become very familiar with the feel of it.

The other options for the meaning of the idiom are incorrect. Copying another's trade secrets does not involve knowing something like the back of one's hand. Hitting someone with the back of one's hand is not the same as knowing something like the back of one's hand. Being unaware of the situation does not mean that you know something like the back of one's hand.