To Block

1. (transitive) To fill or obstruct (something) so that it is not possible to pass.
2. (transitive) To prevent (something or someone) from passing.
3. (transitive) To prevent (something from happening or someone from doing something).*
4. (transitive, sports) To impede (an opponent or opponent's play).
5. (transitive, theater) To specify the positions and movements of the actors for (a section of a play or film).
6. (transitive, cricket) To hit with a block.
7. (intransitive, cricket) To play a block shot.
8. (transitive) To bar (someone undesirable) from connecting via telephone, instant messaging, etc., or from accessing an online account or service, or similar.
9. (transitive) To bar (a message or communication), or bar connection with (an online account or service, a designated telephone number, IP address, etc.).
10. (programming, intransitive) To wait for some condition to become true.
11. (transitive) To stretch or mould (a knitted item, a hat, etc.) into the desired shape.
12. (transitive) To shape or sketch out roughly.
13. (transitive, slang, obsolete) To knock (a person's hat) down over their eyes.Synonym: bonnet