My brother’s face twisted into a grimace every time my mother asked him to do chores. of course, his frown disappeared the minute he was allowed to go outside to play.

read the sentences.

which word in the sentence is a synonym for grimace?

Frown

In this sentence, the word grimace and frown are being used as synonyms. The first time the word is used, it describes the scowl that the brother gets when asked to do chores. However, the sentence states that this scowl disappears when he goes outside. Both sentences are talking about the same facial expression.

i guess you are missing the idea that has to be supported, am i right?