mix–up 
/ˈmɪksˌʌp/ noun
plural mix–ups /ˈmɪksˌʌp/ noun [count] : a mistake caused by confusion about something
▪ Because of a mix-up [=mistake, error] at the hotel, we were overcharged for our stay. ▪ The mix-ups nearly cost him his job. ▪ I thought you were someone else. Sorry for the mix-up. [=misunderstanding, confusion] — see also mix up at 1mix
▪ Because of a mix-up [=mistake, error] at the hotel, we were overcharged for our stay. ▪ The mix-ups nearly cost him his job. ▪ I thought you were someone else. Sorry for the mix-up. [=misunderstanding, confusion] — see also mix up at 1mix
