Sentence:  She had Lord James' collar in one big fist and she pounded the table with the other and talked a blue streak. Nobody could make out plain what she said, for she was <WSD>mainly</WSD> jabbering Swede lingo, but there was English enough, of a kind, to give us some idee. 
Meaning of the word marked with <WSD> tags:  Chiefly; for the most part. (from 17th c.)