knuckle
n.（指人）指关节；（指动物）膝关节，肘；铰结，肘形接；铜指节套
vt.用指关节打、压、碰、擦
网络解释.关节；指节；转向节；指关节
词形变化:
复数：knuckles 复数：knuckled 复数：knuckled 复数：knuckling 复数：knuckles
派生词: knuckly
双语例句
1. 1 . The United States, he said, did not knuckle under to demands.
他说，美国不会屈从于他人的要求。
来自柯林斯例句