A spell of protection. The verb form is “sained.”
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Sian Term Timeline in Lady Macbeth
The timeline below shows where the term Sian appears in Lady Macbeth. The colored dots and icons indicate which themes are associated with that appearance.
Chapter 1
...with Bethoc and Aella to look for herbs, but does not have anyone give a sian, or protective oath, for them that day. A group of Norsemen kill her guard and...
(full context)