MACKEREL-BACK Meaning of MACKEREL-BACK in English ˈ ̷ ̷( ̷ ̷) ̷ ̷ˌ ̷ ̷ nounor mackerel-backed sky ˈ ̷ ̷( ̷ ̷) ̷ ̷ˌ ̷ ̷- : mackerel sky Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012