recurve

Short definition from Wiktionary

Noun

1. 1
   A type of knife blade shape that involves several curves including a concave curve on a portion of the edge, resulting in a belly that is lower than the handle bottom.
2. 2
   A recurve bow.
3. 3
   A landform consisting of a hook at the tip of a coastal spit.

Verb

1. 1
   To curve again, to rebend.
2. 2
   To curve back on itself.
3. 3
   To change direction.