What does dead mean?

[Ivanov]

English Grammar Tests, Elementary Level

ESL/EFL Test #60 "Chit Chat: In the theatre", question 7

Alice: Yes, you're ......... right. I've seen him on tv loads of times.

(a) fully
(b) alive
(c) dead
(d) clear

English Grammar Tests, Elementary Level

ESL/EFL Test #60 "Chit Chat: In the theatre", answer 7

Alice: Yes, you're dead right. I've seen him on tv loads of times.

Correct answer: (c) dead
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what does dead mean?

Ivanov

[Alan]

Hi Ivanov,

You're dead right means: You're absolutely right. I'm dead certain means: I'm absolutely/totally certain.

Alan
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English as a Second Language
You can read my ESL story Communicating with you?

[lisa_mard]

the why not fully right ???