Wiktionary
vb. (en-third-person singularthin out)
Usage examples of "thins out".
And so, in the autumn of 1972, we had arrived (the steam thins out this far from the showers and I can see my old friends clearly): Reetika Churaswami, with her enormous yellow eyes and sparrow’.
A few minutes later the traffic thins out, and Danny and Pam think their job is pretty much over.
The thick cloud of grey smoke eats fuselage, cockpit, wings, then thins out as they disappear.
Further down it thins out to a sufficient degree to become recognizable as to its individual components.
When a woman grows old, her hair thins out like that, like a life grows thin and stretched out, too, reaching the end of usefulness.
The long parade of students thins out as it passes the Heights business section with its sandwich shops and candy stores.
Either way, that disturbance beneath the ground thins out the closer you get to the forest.