Meaning : Filled with melancholy and despondency.
Gloomy at the thought of what he had to face.
A gloomy silence.
Took a grim view of the economy.
The darkening mood.
Lonely and blue in a strange city.
Depressed by the loss of his job.
A dispirited and resigned expression on her face.
Downcast after his defeat.
Feeling discouraged and downhearted.
Down in the mouth ka meaning, vilom shabd, paryayvachi aur samanarthi shabd in Hindi. Down in the mouth ka matlab kya hota hai?