Joint refers to a hand-rolled marijuana cigarette.
Joint attention: This refers to the ability to focus on the same object or event as another person, and to communicate about it using eye gaze, gestures, or verbal communication. Joint attention is an important aspect of social development and can facilitate communication and social interaction.
Joint problem-solving: This refers to the process of working together with others to solve a problem or overcome a challenge. Joint problem-solving can involve collaboration, communication, and negotiation, and can be an important skill in a variety of settings, such as at work, in relationships, or in social groups.
Joint custody: This refers to a legal arrangement in which two parents share physical and legal responsibility for their children after a divorce or separation. Joint custody can involve sharing decision-making authority, parenting time, and other responsibilities related to the care of the children.
In each of these examples, "joint" refers to an activity or arrangement that involves two or more people working together or sharing responsibility.