He plans to 'thin' (out) the young carrots in the garden. [=to remove some of them so that there is more room between the remaining carrots]
His hair is a little 'thin' on top. = He's a little 'thin' on top. [=he does not have a lot of hair on the top of his head]
The bank's decision to raise rates could be 'the thin end of the wedge'. [=many other banks may also decide to raise rates]
(..) Pie for breakfast? FABIENNE: Any time of the day is a good time for pie. Blueberry pie to go with the pancakes. And on top, a thin slice of melted cheese... Where's my watch? FABIENNE: It's there. No, it's not. FABIENNE: (..)1994 Pulp Fiction