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]
(..) the front of the ship off? You want to send a man into space without the front of his ship? Mars' atmosphere is so thin, you don't need a lot of streamlining. By the time the ship's going fast enough (..)2015 The Martian