pitch in
US /pɪtʃ ɪn/
UK /pɪtʃ ɪn/

1.
colaborar, contribuir, ayudar
to join in and help with an activity or task, especially by contributing money or effort
:
•
Everyone pitched in to clean up the park after the festival.
Todos colaboraron para limpiar el parque después del festival.
•
If we all pitch in, we can finish this project by tomorrow.
Si todos colaboramos, podemos terminar este proyecto para mañana.