Etymology
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signpost (n.)

also sign-post, 1610s, "sign on a post, usually indicating an inn or shop," from sign (n.) + post (n.1). Meaning "guide- or direction-post along a road" is attested from 1863. Figurative sense is from 1889.

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Definitions of signpost
1
signpost (v.)
mark with a signpost, as of a path;
2
signpost (n.)
a post bearing a sign that gives directions or shows the way;
Synonyms: guidepost
From wordnet.princeton.edu