・blind as a bat.

・cool as a cucumber.

・happy as happy can be ＝very happy.

・still as still＝very still.

3a [否定の比較; so [as]…as として] …ほど (cf. conj. 2 a ★).

・I am not so tall as he. 彼ほど背が高くない.

・She was not so [as] young as she looked. 見かけほど若くなかった.

b [結果・目的; so…as to do として].

・I so arranged matters as to suit [I arranged matters so as to suit] all of you. 君たち皆に都合のいいように計らった.

・He was so kind as (＝kind enough) to help me. 親切にも私を助けてくれた.