Select the most appropriate meaning of the given idiom.

Water under the bridge

Anything from the past that is not significant or important anymore

The most appropriate meaning of the given idiom "water under the bridge" is anything from the past that is not significant or important anymore.

It is used to describe something that has happened in the past and should not be dwelled on. The idiom is thought to have originated from the idea that water that has flowed under a bridge is gone and cannot be retrieved.

For example, you might say "That argument is water under the bridge. Let's forget about it and move on." This means that the argument is no longer important and should not be discussed anymore.

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

• Something which happens all the time: This idiom is not related to the idiom "water under the bridge."
• Something that does not affect the past: This idiom is more accurately described as "something that is irrelevant."
• A problem which has been existing and will continue to exist in the future: This idiom is not related to the idiom "water under the bridge."