We don't have any synonyms for sain yet.
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Definition of sain:
(v) :
(transitive, archaic) To bless, to keep from evil influence.
(v) :
(transitive, archaic) To make the sign of the cross on or over something or someone.
(v) :
(intransitive, obsolete except in Scots) To make the sign of the cross.
(n) :
A surname.