Learning is taking in new facts, while studying is looking over stuff you already know to prepare for a test. For example: You look over flash cards while studying to remember things you already know. While st school, you take in new information.
Answer:
it means to have an extreme or irrational fear of small spaces :)
Iago and Othello are comrades in the eyes of Othello, but Iago envys him and is appalled he didn’t get the promotion that he thought he deserved. Othello trusts Iago with his life and Iago hates Othello.
I would say that they're comparing the situation that they're in to a leaking boat.