A more thorough explanation:

Ad jungendum auxilium is a Latin legal term that means "to join in aid."

When two or more parties join together to provide assistance or support to a common cause, they are said to be ad jungendum auxilium. For example, if two companies are facing a lawsuit and they decide to work together to defend themselves, they are joining in aid and can be described as being ad jungendum auxilium.

Another example could be a group of individuals who come together to support a charitable cause. They are joining in aid to help the organization achieve its goals.

The term ad jungendum auxilium is used in legal contexts to describe situations where multiple parties are working together to achieve a common goal. It emphasizes the idea of cooperation and mutual support, and is often used in situations where the parties involved are facing a challenge or obstacle that they cannot overcome alone.