A more thorough explanation:

Second is a term used in two different contexts:

1. In parliamentary law, it refers to a statement made by a member of a group who supports a motion made by another member. This statement is made to indicate that the member wants the group to consider the motion. For example, "Is there a second to the motion?"
2. In criminal law, a second is a person who assists or supports another person engaged in a duel.

• Example of parliamentary law: During a meeting, a member proposes a motion to increase the budget for a project. Another member supports the motion and says, "I second the motion."
• Example of criminal law: In the past, dueling was a common way to settle disputes. A person who supported one of the duelists and helped them prepare for the duel was called a second.

The examples illustrate how the term "second" is used in different contexts. In parliamentary law, a second is used to show support for a motion. In criminal law, a second is someone who assists in a duel.