I answered this once so this is I'm my opinion
Hoped it helped you
It can cause forced labor in many parts of the world
It entails being out of touch with reality, where your optimism isn't grounded in comparison to the situation you're in.
For example, imagine climbing Mount Everest and you underestimate the weather, which are underestimating obstacles and risks.
Try you best and look it up
but also yhu could just do what i do and just look at what it saids and reread it