This dictionary term meaning "old" is applied to words like "wast"
wast synonyms, wast pronunciation, wast translation, English ... 
Word / Article ... archaic or dialect (used with the pronoun: thou or its relative 
equivalent) a singular ... [Middle English, Old English, unstressed form of b by1] 
... like thee to go an' look at him, for he war allays so pleased when thee wast 
mild to him.