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]
(..) I'll go to Atlanta. I can't fight you both. Well, here's your new mill hands, Mrs. Kennedy. The pick of all the best jails in Georgia. They look pretty thin and weak to me, Gallegher. Halt! They're the best you can lease, ma'am. And if you'll just give Johnny Gallegher a free hand... (..)1939 Gone with the Wind
(..) Ain't nobody got that much money. Nobody but Yankees and scalawags got that much money now. Rhett! Who that? A Yankee? Oh, Mammy, I'm so thin and pale and... ...l haven't any clothes. Scoot up to the attic and get down Ma's old box of dress patterns. What you up to with Miss Ellen's portieres? (..)1939 Gone with the Wind