The phrase "muffled sob" is correct and usable in written English. You could use it to describe a person who is in the process of crying quietly so as to not draw too much attention. For example, "The little girl covered her face with her hands and tried to hide her muffled sob." Through the silence came the occasional muffled sob.

In this article, we will explore a comprehensive list of sad feeling words in English. A sudden and severe decline, often leading to sadness or ruin. Filled with sorrow and mourning. Feeling a deep sense of regret or remorse. Feeling sad and dispirited. Filled with anxiety and worry.

The strange low sobs that shook their common bed Were called into her with a sharp surprise, And strangled mute, like little gaping snakes, Dreadfully venomous to him. She lay Stone-still, and the long darkness flowed away With muffled pulses. Then, as midnight makes Her giant heart of Memory and Tears Drink the pale drug of silence, and so beat

She continued to cry in muffled sobs against his chest. She was sure he would speak soft, tender words to her such as her father had uttered before his death, and that she would not be able to bear it and would burst into sobs in his presence.

Her sobs were muffled, maybe to keep her 3-year-old son from seeing his mother in such distress.