A pipe dream noun phrase
Used to refer to an impossible plan or idea
We will not be able to complete this project in one month. It is a pipe dream.
Their plan is impractical. It's nothing more than a pipe dream.
In the past, traveling to Mars was believed to be a pipe dream.
To deal with something when it happens without planning for it beforehand
Said when you believe something will never hapen
Impossible or unrealistic dreams, hopes, or plans
Something that is impossible to happen, to achieve, or to be done.
To consider or think about what will happen in the future
To overcome some disadvantage or get out of a bad situation when you have already lost a lot of time for it
We love Tim but we all think that it's impossible he can make up leeway and win first place in the race.