raise someone's shag

To cause the hair on the nape of an animal's neck to rise, as happens when it is angry or alarmed. Compare raise someone's hackles.

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raise someone's shag (third-person singular simple present raises someone's shag, present participle raising someone's shag, simple past and past participle raised someone's shag)

1. (obsolete, East Anglia, idiomatic) To anger or annoy someone.

• See Thesaurus:enrage

• Wright, Joseph (1904) The English Dialect Dictionary‎, volume 5, Oxford: Oxford University Press, page 345