expression
it's probably so; it stands to reason
A somewhat formal or literary expression meaning 'it is likely so' or 'that makes sense'. Often used to acknowledge a plausible statement or situation. Compare with さもありなん, which is more common.
See also: さもありなん
彼がそう言うなら、さもあらん。
If he says so, it's probably true.
あの二人が結婚するという噂は、さもあらんと思える。
The rumor that those two are getting married seems quite plausible.