Definitions

1. 1. mutual exchange of assistance (idiom)
2. 2. to benefit from each other's strengths and make up each other's shortfalls
3. 3. to reciprocate with material assistance
4. 4. scratch each other's back

Components

• 互通 hù tōng – to intercommunicate
• 有无 yǒu wú – to have or have not