Una frase idiomatica cuyo significado no es deducible si se traduce palabra por palabra.
sin traducción directa
No entiendo por qué siempre andas cabizbajo, mirando el celular.I don't understand why you always walk along with your head down, looking at your cellphone.
Luisa caminaba rápido, cabizbaja: algo malo le pasaba.Luisa was walking quickly, with her head down - something was wrong with her.