一个巴掌拍不响

1. • lit. one palm alone cannot clap (proverb)
2. • fig. it takes two persons to start a dispute
3. • it takes two to tango
4. • it's difficult to achieve anything without support

Character by character

• 一(yī)one
• 个(ge)(classifier used before a noun that has no specific classifier)
• 巴(bā)long for
• 掌(zhǎng)palm of the hand
• 拍(pāi)pat
• 不(bù)no
• 响(xiǎng)echo