sign ‧ board /ˈsaɪnbɔːd $ -bɔːrd/ BrE AmE noun [countable]
a flat piece of wood, ↑ cardboard etc in a public place, with writing on it that gives people information
sign ‧ board /ˈsaɪnbɔːd $ -bɔːrd/ BrE AmE noun [countable]
a flat piece of wood, ↑ cardboard etc in a public place, with writing on it that gives people information
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012