動詞 pitch in:

1. eat heartily
   同義詞：dig in

1. After the christmas dinner, we all pitch in to clean up the house.
   耶誕晚餐後，我們全都動手幫助清理房子。
2. An electromagnetic wave of audio frequency produced by atmospheric disturbances such as lightning, having a characteristically decreasing frequency responsible for a whistling sound of descending pitch in detection equipment.
   嘯聲干擾一種由于諸如閃電等大氣干擾而產(chǎn)生的音頻電磁波，具有典型的逐漸減弱頻率的特征，該頻減引起了檢波設備中調逐漸下降的嘯聲
3. The fans rushed onto the pitch in an excited mob.
   球迷群情激昂，一窩蜂涌進球場。