fluff sth up
up 可以放在宾语后面；宾语是代词时必须说 fluff it up。
She fluffed up the cushions before the guests arrived.
客人到来之前，她把靠垫拍得蓬松起来。
变蓬松；鼓起；绒毛般飘动；轻飘；使蓬松；使松软；变得蓬松；膨胀起来；像绒毛一样轻轻飘动
To make something soft and light, for example by shaking or patting it.
使蓬松；使松软
To make something fluffy.
变得蓬松；膨胀起来
To become fluffy, puff up.
像绒毛一样轻轻飘动
To move lightly like fluff.
一般现在时
She fluffs her hair every morning.
她每天早上都会把头发弄蓬松。
一般过去时
He fluffed his lines during the play.
他在表演中念错了台词。
现在进行时
The cat is fluffing its tail.
那只猫正在把尾巴弄蓬松。
常见意思：使蓬松；出错。
She fluffed the pillows before the guests arrived.
她在客人到来之前把枕头抖松。
用法提示：fluff在此用作及物动词，意为‘抖松’（使变得蓬松柔软）。
He fluffed his hair in the mirror.
他在镜子前把头发弄蓬松。
用法提示：fluff在此用作及物动词，意为‘使蓬松’。
The actor fluffed his lines during the performance.
那位演员在演出中念错了台词。
用法提示：fluff在此用作及物动词，意为‘念错’（指表演时出错）。
up 可以放在宾语后面；宾语是代词时必须说 fluff it up。
She fluffed up the cushions before the guests arrived.
客人到来之前，她把靠垫拍得蓬松起来。
out 也可放在宾语前，说 fluff out sth；代词宾语则用 fluff it out。
He fluffed the towel out and laid it on the sand.
他把毛巾抖松，铺在沙滩上。
这里不接宾语，主语是变蓬松、鼓起来的事物。
The rice fluffs up nicely when you add a little butter.
加一点黄油，米饭就会变得蓬松。
多用于枕头、靠垫等填充物，强调拍打发松；在“把枕头拍松”的情境下比 fluff 更常用、更具体。
强调因空气或水分而鼓起来，可用于羽毛、头发、脸颊等；更侧重体积膨胀，不一定包含“柔软”的语义。
侧重通过抖动使毯子、床单等散开、变松；如果对象是枕头且用“拍”的动作，则 plump up 更地道。
对象多为土、纤维、结块等紧实物；语义比 fluff 宽，只强调“不紧实”，没有蓬松、柔和的意象。
grammar · medium
易错句子The blanket is very fluff.
正确表达The blanket is very fluffy.
fluff 是动词，不能放在系动词后作表语来描述触感；表示“蓬松的、毛茸茸的”应使用形容词 fluffy，因此 be 动词后要接 fluffy。
grammar · medium
易错句子She fluffed up it before putting it on the bed.
正确表达She fluffed it up before putting it on the bed.
fluff up 属于“动词+副词”结构的短语动词，当宾语是人称代词 it/them 时，代词必须放在动词与副词之间，即 fluff it up，而不能说 fluff up it。
本组反义词对应 fluff 作动词、表示“使蓬松（如抖松枕头）”的义项。反义词为“使变平/压紧”。fluff 的“飘动”义项不在此列，因无直接反义词。
fluff 指通过抖动或梳理使纤维蓬松柔软；puff 强调因受热或充气而体积涨大、鼓起来。可说 fluff up a pillow，但 pillow 不用 puff up 表示拍松；糕点等用 puff up 表示膨胀。
fluff 侧重使内部纤维松散、轻盈（如枕头、羽绒服）；plump 侧重使外形饱满、圆鼓（如靠垫、沙发垫），常与 up 连用。
把枕头拍松
She fluffed the pillows before the guests arrived.
客人们到来之前，她把枕头拍松了。
把头发弄蓬松
He fluffed his hair in the mirror before leaving.
出门前，他对着镜子把头发弄得蓬松。
抖松羽毛
The robin fluffed out its feathers against the cold.
知更鸟抖松羽毛以御寒。
用叉子把米饭拨松
Fluff the rice with a fork before serving.
上桌前用叉子把米饭拨松。
变得蓬松；膨胀起来
The egg whites fluffed up when I whisked them.
我搅打蛋清时，蛋清变得蓬松起来。
使蓬松；抖松
She fluffed up the pillows before the guests arrived.
客人到来之前，她把枕头抖松了。
使蓬松展开
The bird fluffed out its feathers to keep warm.
鸟儿把羽毛蓬松地展开以保暖。
说错台词；念错台词
The actor fluffed his lines during the first performance.
那位演员在首场演出时念错了台词。
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.