--- as --- Used with an adjective or adverb in a comparison or with the effect of a superlative. John is as tall as his father now. I didn't do as badly today as I did yesterday. John's father gave him a hard job and told him to do as well as possible. The sick girl was not hungry, but her mother told her to eat as much as she could. Also used in the form "so --- as" in some sentences, especially negative sentences. This hill isn't nearly so high as the last one we climbed. Often used in similes (comparisons that are figures of speech). The baby mouse looked as big as a minute. Jim's face was red as a beet after he made the foolish mistake. Most similes in conventional use are cliches, avoided by careful speakers and writers.
AS
Meaning of AS in English
American idioms English vocabulary. Английский словарь американских идиом. 2012