niè​chǐ

rodent

啮齿 嚙齒 niè​chǐ
rodent noun
a rodent; pertaining to the order Rodentia (gnawing mammals)
to gnaw
to gnaw; to bite with the teeth like a rodent
to gnash one's teeth
(literary) to gnash one's teeth as a sign of extreme anger; used in the same way as 咬牙切齿 yǎo​yá​qiè​chǐ

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Synonym