When his mother walked into the house, she made a grimace, a pained expression that dissolved when the teenager hurriedly turned down the blasting music.
The blank should be filled with a word whose meaning is ' a pained expression.' The word 'grimace' means to make an expression out of pain, disgust, or amusement. It is an absurd expression that expresses the action of flinching or getting irritated at something.
In the passage, the teenage boy was playing loud music. Most elders do not like loud music in the house, and thus, when the mother entered the house, she was pained to hear the loud music.
Hence she gave the grimacing expression to show that the music was painfully loud for her, and seeing that expression, the boy lowered it down.
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