Hold an eel by the tail idiom
To try to grab someone or something that is elusive.
He is a slippery salesman, so it is difficult to hold an eel by the tail.
The plan seems hard to hold an eel by the tail to keep up with the progress of project.
Stock market is hard to hold an eel by the tail in the COVID-19 pandemic.
Deceitful, calculating, and unreliable; elusive.
The verb "hold" should be conjugated according to its tense.
This phrase is used to describe something very modern or updated or something that no longer looks like what it's used to.
It has been a long time since I left my high school, and now I have to admit that it's certainly not your father's high school anymore.