1. take action or make an agreement
deal with a problem/issue/client
To 'deal with' something or someone means to engage with it or give it attention. To deal with something often involves solving a problem or providing a solution. You might ask in work, "Would you like me to deal with this client?", meaning that you intend to look after the client and solve any issues that they have. If you 'can't deal with' something it means you are having difficulty solving it. You might ask, "How will we deal with this problem?", in order to invite possible solutions. This expression can be used in social and professional contexts.