Synergising means working together to create a better result than working alone.
Synergising is usually seen as a positive thing, where people or things are helping each other to make something better.
Examples:
We are synergising to finish the project.
Synergising with others makes the work easier.
The team is synergising to win the game.
The animals are synergising to build a home.
Synergising with my friends makes everything more fun.
I like synergising with my sister to make a big tower.