over my dead body

over my dead body {infml} (if you say that something will happen over your dead body, you mean that you will do everything you can to prevent it ) — только через мой труп
Used to show you are strongly opposed to sth

Example 1: She moves into our home over my dead body.

Example 2: Josh says he's going to buy a motorbike.' 'Over my dead body!'

Example 3: If they cut down those trees, they'll do it over my dead body.

see also
[ни за что на свете]