• на ком, на кого having become disillusioned with someone, to cease hoping for anything good from him: have up on someone (as hopeless)
    • write someone off
    • erase from memory
    • на чeм, на что having become convinced that something is worthless, some undertaking is sure to fail etc. to stop thinking about it, stop investing time, energy etc. into it: give something up as hopeless (lost, a waste of time)
    • kiss something good-bye (goodbye)
    • write something off
    • call it quits with something
    • erase from memory