Sains vs Swains - What's the difference?

As a verb sains

is (sain).

(head)

(sain)

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(en verb)

(archaic) To make the sign of the cross on or over something or someone.

To make the sign of the cross.

(archaic) To bless, to keep from evil influence.

1983 , Robert Nye, The Facts of Life :

The child was sained then. Fir candles were lighted and whirled round the bed in which mother and infant lay.