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]
(..) then we had a meat or a fish. Paulie did the prep work. He was doing a year for contempt... ... and had a wonderful system for garlic. He used a razor and sliced it so thin... ... it would liquefy in the pan with a little oil. It was a very good system. Vinnie was in charge of the tomato sauce. (..)1990 Goodfellas