niè chǐ
a rodent (rat, rabbit etc)
niè chǐ lèi
rodents (rat, rabbit etc)
niè chǐ mù
order of rodents (rats, squirrels etc)
qióng shǔ niè lí
a desperate rat will bite the fox (idiom); the smallest worm will turn being trodden on
niè hé
(of opposing teeth, or gears) to mesh
to engage