+4 = 7 

zhī

  1. 形容動物細碎尖銳聲音松鼠。」兒女英雄傳·第一一回》:未完山腰一聲這頭響箭一直半空裡。」讀為ㄗ zī。

(onom.)​ creaking or groaning, (onom.)​ to squeak (of mice)​, to chirp or peep (of small birds)​
(onom.)​ craquement ou grognement, (onom.)​ grincement