Does the expression "Lose your life" imply dualism?
Consider the expression "to lose your life" and related ones, "to be robbed of your life", "to have the rest of your life stolen from you".
To lose something makes a division of time into a 'before' and an 'after' the loss. The effects in terms of dismay, grief and pain obviously belong to the after. Experiencing this loss requires the presence of an affected subject.
This is all quite clear for the loss of everything, from a key to a beloved spouse. Everything, except if the lost object is your own life. Because if you are a materialist, there is no experiencing subject in the after when life has ceased. This means that expressions like "losing your life", "being deprived of the rest of your life" etc, all seem to presuppose a dualistic attitude, creating images of an after-life spirit sitting on a cloud mourning its lost earthly life.