pitch in
US /pɪtʃ ɪn/
UK /pɪtʃ ɪn/
1.
齐心协力, 出力, 捐助
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.
节后大家齐心协力清理公园。
•
If we all pitch in, we can finish this project by tomorrow.
如果我们都出力，明天就能完成这个项目。