Here's why:
* It's grammatically unusual: Idioms usually make sense grammatically. "Small fish to catch great" doesn't have a clear subject and verb.
* It lacks a clear meaning: What would it mean to be a "small fish to catch great"?
Possible Interpretations
It's possible that the phrase is trying to convey something like:
* Targeting a large goal with limited resources: This could be a metaphor for someone trying to achieve something big while lacking the necessary skills, knowledge, or power.
* Overestimating one's abilities: This could describe someone who believes they can easily achieve something challenging, not realizing the difficulty involved.
Common Idioms with Similar Meanings
Here are some established idioms that might be relevant to the intended meaning:
* Trying to catch a big fish in a small pond: This idiom describes someone who wants to achieve something ambitious within a limited environment.
* Trying to bite off more than you can chew: This idiom describes someone who takes on a task that is too difficult or challenging for them.
* Shooting for the moon: This idiom describes someone who has ambitious goals.
It's important to understand the context in which the phrase is used to determine its intended meaning.