pitch in
US /pɪtʃ ɪn/
UK /pɪtʃ ɪn/

1.
ikut membantu, berkontribusi, menyumbang
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.
Semua orang ikut membantu membersihkan taman setelah festival.
•
If we all pitch in, we can finish this project by tomorrow.
Jika kita semua ikut serta, kita bisa menyelesaikan proyek ini besok.