E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Shadow (To).
To follow about like a shadow. This is done by some person or persons appointed to watch the movements and keep au fait with the doings of suspicious characters.
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“He [Jesus] was shadowed by spies, who were stirring up the crowd against Him.”—Longman’s Magazine, 1891, p. 238.
