secret cooperation

noun
UK /ˈsiː.krət kəʊˌɒp.əˈreɪ.ʃən/
US /ˈsiː.krət koʊˌɑː.pəˈreɪ.ʃən/

When people work together in a hidden way so others do not know.

The two friends made a secret cooperation to plan a surprise party for their teacher.


OTHER MEANINGS

2. A private agreement between groups to help each other without telling anyone.

The two companies had a secret cooperation to share new ideas.

3. Working together quietly behind the scenes to reach a shared goal.

The spies used secret cooperation to finish their mission.

4. A hidden partnership between people who trust each other.

Their secret cooperation helped them win the game.