Beat my head off

[Batman]

Test No. incompl/advan-62 "Bite, Bit, Bitten", question 3

They were so angry with me they practically bit my ......... off.

(a) nose
(b) hand
(c) fingers
(d) head

Test No. incompl/advan-62 "Bite, Bit, Bitten", answer 3

They were so angry with me they practically bit my head off.

Correct answer: (d) head

Hello, could you tell me please meaning of "bit my head off"
Many thanks
batman

[Torsten]

Hi Batman,

If somebody responds to a comment of yours in an angry or reproachful way, they bite your head off, that is they act in a very angry way.

TOEIC listening, photographs: Break for a smoke

[Batman]

Hello Torsten, many thanks
Batman