風馬牛不相及

1. • to be completely unrelated to one another (idiom)
2. • irrelevant

Character by character

• 風(fēng)wind
• 馬(mǎ)surname Ma
• 牛(niú)surname Niu
• 不(bù)no
• 相(xiāng)surname Xiang
• 及(jí)and