to make something clear
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耳を澄ますと虫の声が聞こえる。
If you listen carefully, you can hear the insects.
彼は何事もないような顔を澄ましていた。
He kept a composed face as if nothing had happened.
物音に耳を澄まして様子をうかがった。
I strained my ears at the sound and checked what was happening.