beer mat(mat, often with an advertisement for a brewery on it, to rest one's glass) noun [UK: bɪə(r) mæt] [US: ˈbɪr ˈmæt]
coaster [coasters](small object on which a cup, etc., is placed to protect a table surface) noun [UK: ˈkəʊ.stə(r)] [US: ˈkoʊ.stə(r)]I used to collect coasters. = Antes coleccionaba posavasos.