1
to clear;to make clear
あの社長秘書はいつも澄ましている。
That president's secretary is always prim.
2
to be unruffled;to look unconcerned;to feign indifference
3
to look demure;to look prim;to put on airs
4
to strain (one's ears);to listen carefully
See also:
耳を澄ます (みみをすます)
Other forms
清ます 【すます】