互通有無 (wu6 tung1 jau5 mou4) — each supplies what the other needs; help supply each other's needs in Cantonese
wuˍ₆互tungˉ¹通jauˏ₅有mouˎ₄無简 互通有无
Mandarin Pinyin: hu4 tong1 you3 wu2
Meaning of 互通有無
nouneach supplies what the other needs; help supply each other's needs