to bump smb. to death means to attack and hurt?

[Mirko]

English Language Tests, Intermediate level

ESL/EFL Test #440 "English Slang Idioms (179)", question 2

"Did you hear that our boss is in jail? I guess he tried to bump his wife ......... the other night and she managed to escape and call the police. Crazy, isn't it? I never would have thought that a guy that nice would be capable of something like that," James said to Raquel.

(a) off
(b) in
(c) down
(d) to death

English Language Tests, Intermediate level

ESL/EFL Test #440 "English Slang Idioms (179)", answer 2

"Did you hear that our boss is in jail? I guess he tried to bump his wife off the other night and she managed to escape and call the police. Crazy, isn't it? I never would have thought that a guy that nice would be capable of something like that," James said to Raquel.

Correct answer: (a) off
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to bump smb. to death means to attack and hurt?

[Mister Micawber]

That is not the idiom. The idiom is 'to bump off', which means 'to kill'.
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Native English teacher at Mister Micawber's