Sentence:  Andrew knew that Geordie would not have had a smoke for a long time, and this was his way of leaving him with a pipeful of tobacco./ "I think my pipe's on the mantelshelf," returned Geordie, "but I <WSD>doot</WSD> it's empty."/ Andrew took down the pipe, filled it generously ... 
Meaning of the word marked with <WSD> tags:  think