Sentence:  As at Walden, in sultry dog-day weather, looking down through the woods on some of its bays which are not so deep but that the reflection from the bottom <WSD>tinges</WSD> them, its waters are of a misty bluish-green or glaucous color. 
Meaning of the word marked with <WSD> tags:  To add a small amount of colour; to tint;  to add a small amount of some other thing.