筋 jīn pairs 𥫗, bamboo, with 肋, an empty part that once was a variant of 剥 bāo, 'to peel.' The bamboo fits the first sense, 'bamboo sinew,' which grew to 'tendon' and 'muscle.'
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Example Sentences
他的腿部筋受伤了。
tādetuǐbùjīnshòushāngle 。
He injured the tendons in his leg.
锻炼可以增强肌肉和筋的力量。
duànliànkěyǐzēngqiángjīròuhéjīndelìliàng 。
Exercise can strengthen the muscles and tendons.
医生说我需要休息，筋太紧了。
yīshēngshuōwǒxūyàoxiūxī ， jīntàijǐnle 。
The doctor said I need to rest because my tendons are too tight.