An adverb meaning 'really' or 'apparently', used to indicate that something seems or appears to be a certain way (often in constructions like 'さも〜そうに').
彼はさも知っているかのように話したが、実は初めて聞いたという。
He spoke as if he knew all about it, but in fact he said it was his first time hearing it.
さも当然のように振る舞うのはやめてほしい。
I wish you'd stop behaving as if something were obvious or natural.
彼女はさも困ったような表情を浮かべた。
She put on a look as if she were troubled.
An adverb meaning 'in that way' or 'thus', indicating manner or mode; somewhat literary or archaic.
さもあれば、別の道を探るべきだ。
If that is the case, we should look for another way.
彼はさも言わんばかりに首をかしげた。
He tilted his head as if to say so.
さもあれ、まずは事実を確認しよう。
Be that as it may, let's first confirm the facts.