bite off

verb3

1. •
   To bite so hard as to remove something from its source.

   • Then she cocked her head back, opened her mouth, and bit off the trout's top half. — 1999
2. •
   To acquire, especially in an abrupt or forceful manner.

   • To thicken that buffer zone Britain joined other powers in biting off larger chunks of China. — 1997
3. •
   To accept or commit oneself to a task, project, notion, or responsibility, especially one which presents challenges.

   • In between what she called the "goody-good" or "frilly-knickers" Hollywood films, she bit off some more demanding parts back home. — 1967