Stop sign (4,3)
(Other definitions for keep out that I've seen before include "notice to trespassers?" , "Stay clear" , "sign of an exclusive establishment" , "Don't trespass" , "bar" .)
(Other definitions for red that I've seen before include "Colour of blood" , "Bloodshot" , "Type of wine" , "Colour of 1 across" , "Carmine" .)