For all the world as if/though…
Definition 1 of 1
Pro Tip 1/3Emphasizes Similarity
This phrase accentuates a high degree of resemblance to a certain situation or appearance. 
She sang for all the world as if she were a professional opera singer.
Pro Tip 2/3Strong Assumption
Suggest that an assumption is being made based on strong evidence or belief, not a confirmed fact. 
He behaves for all the world as though he owns the place.
Pro Tip 3/3Hyperbolic Effect
This phrase often adds drama or exaggeration to a description, making it more vivid. 
The child smiled for all the world as if she had not a single care.