Final answer:
An 'in-progress' call refers to a phone call that is currently ongoing or in the process of being conducted.
Step-by-step explanation:
An 'in-progress' call refers to a phone call that is currently ongoing or in the process of being conducted. In the context of computers and technology, 'in-progress' calls are often associated with features such as call forwarding, call waiting, or call conferencing, where users can manage or switch between multiple calls. For example, in a telecommunications system, if a user is already engaged in a conversation and receives another call, the system will indicate that the second call is an 'in-progress' call.