Условие задания:

3 Б.
Write the word for each definition:
1. Involving two people or groups of people who behave in the same way or agree to help each other and give each other advantages
2. To move your head down and then up, sometimes several times, especially to show agreement, approval, or greeting, or to show something by doing this
3. A real or imagined line that marks the edge or limit of something