1
with one's knuckles
knuckles 表示“指节”时常用复数，并与物主代词连用，如 one's knuckles。
She tapped on the glass with her knuckles.
她用指关节敲了敲玻璃。
指节；指关节
先理解核心含义，再看它在真实句子里的用法。
指节；指关节
a joint of a finger when the fist is closed
She tapped on the glass with her knuckles.
她用指关节敲了敲玻璃。
Any of the joints between the bones of the fingers.
握拳时手指的关节
a joint of a finger when the fist is closed
A mechanical joint.
The curved part of the cushion at the entrance to the pockets on a cue sports table.
He knocked twice on the table with his knuckles to get everyone's attention.
他用指节在桌上敲了两下，以引起大家的注意。
Her knuckles turned white as she gripped the steering wheel.
她紧握方向盘时，指节都变白了。
I grazed my knuckles on the rough wall while moving the sofa.
我搬沙发时，指节蹭到了粗糙的墙壁上。
knuckles 表示“指节”时常用复数，并与物主代词连用，如 one's knuckles。
She tapped on the glass with her knuckles.
她用指关节敲了敲玻璃。
动词 knuckle 表示“用指节击打”，直接接击打的对象。
He knuckled the table in frustration.
他沮丧地用指节敲打桌子。
若要说明具体击打部位，可在宾语后用 on/in 接身体部位。
She knuckled him on the back.
她用指关节敲他的背。
Not this
She has strong knuckle.
Use this
She has strong knuckles.
knuckle 是可数名词，指多个指关节时应用复数 knuckles；中文名词没有复数变化，容易漏加 -s。
Not this
The teacher hit him in the knuckles with a ruler.
Use this
The teacher hit him on the knuckles with a ruler.
表示击打身体某一部位（表面）时，介词用 on，不用 in；因此是 hit him on the knuckles。
Not this
She knuckled on the door and waited.
Use this
She knocked on the door and waited.
knuckle 作动词不是“敲门”；“敲门”应用 knock on the door。不要因拼写相近而混淆。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
擦伤指节
He scraped his knuckles while fixing the engine.
他修发动机时擦伤了指节。
因紧张而发白的指节
She watched the horror movie with white knuckles.
她看恐怖片时紧张得指节发白。
批评；训斥
The school gave him a rap on the knuckles for cheating.
学校因他作弊而训斥了他。
赤手空拳；不戴拳套的拳头
In the street fight, he used bare knuckles.
在那场街头斗殴中，他赤手空拳。
指关节
His knuckle joint was swollen after the punch.
那一拳之后他的指关节肿了。
开始认真工作/努力用功
If you want to pass the exam, you'd better knuckle down and study.
如果你想通过考试，最好开始认真用功学习。
屈服，让步，认输
The workers refused to knuckle under to the manager's threats.
工人们拒绝屈服于经理的威胁。
令人紧张得攥紧拳头的；惊险刺激的
The helicopter ride through the storm was a white-knuckle experience.
乘直升机穿越暴风是一次令人紧张得攥紧拳头的经历。
Use knuckle naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
握拳时指节凸起像小圆扣；knuckle的k也像凸出的骨节，记住这个词。
语域：neutral 常见场景：hand anatomy、boxing / martial arts、everyday talk about hands or fists 这里按名词用法分析，指“指节/指关节”。通常用于描述手部结构、握拳动作或运动伤害，属于中性常用词，正式书面语和日常口语中都比较常见。
Rhymes: buckle, chuckle, and suckle all end in /ʌkəl/ and rhyme with knuckle. Beware lookalikes that do not rhyme: nickel /ˈnɪkəl/ has a different vowel, nuclear /ˈnuːkliər/ has a different vowel and extra syllable, and knock /nɒk/ has a different vowel and no final -le.
Dictionary facts from ECDICT, WIKTIONARY.