[for supps] what do u do when u're adc is very bad?

do u leave the lane to help other lanes to get fed ? or just stay in bot lane to try to make him back or at least stop the feeding ? ps : when i say bad i don't mean he's behind or we boths lost the lane , i mean some ppl [like me] don't know how to play in this role and they're forced by the team or they are trying to learn it or trying a new champion thanks
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