Etymology
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signboard (n.)

also sign-board, 1630s, from sign (n.) + board (n.1).

updated on October 03, 2013

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Definitions of signboard from WordNet

signboard (n.)
structure displaying a board on which advertisements can be posted;
the highway was lined with signboards
Synonyms: sign
From wordnet.princeton.edu, not affiliated with etymonline.