Real Dictionary

blanket
A blanket of something such as snow is a continuous layer of it which hides what is below or beyond it.
You can refer to something such as an unpleasant emotion or an undesirable quality that seems to affect every aspect of a particular situation as a blanket of that emotion or quality.
countable noun: A blanket is a large square or rectangular piece of thick cloth, especially one which you put on a bed to keep you warm.

blanket in American English
a large piece of cloth, often of soft wool, used for warmth as a bed cover or a covering for animals
noun: a large, rectangular piece of soft fabric, often with bound edges, used esp. for warmth as a bed covering

blanket in British English
noun: a large piece of thick cloth for use as a bed covering, animal covering, etc, enabling a person or animal to retain natural body heat

blanket in Hospitality
noun: A blanket is a large square or rectangular piece of thick cloth, especially one that you put on a bed to keep you warm.