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be a slimmer
slimmer 是名词，不是 slim 的比较级。
She is a slimmer.
她是个减肥者。
减肥者；减重者
slimmers — plural of slimmer
先理解核心含义，再看它在真实句子里的用法。
减肥者；减重者
a person who is losing weight, especially through diet and exercise
She is a slimmer.
她是个减肥者。
主要用于英国英语。
通过节食减肥的人
A person who is trying to become slim by dieting.
使变瘦的东西
That which slims.
The gym is full of slimmers who want to get fit before summer.
健身房里挤满了想赶在夏天前健身的减肥者。
As a slimmer, she avoids sugar and exercises every morning.
作为减肥者，她避免吃糖，并且每天早上锻炼。
Many slimmers keep a food diary to track what they eat.
许多减肥者写饮食日记来记录他们吃了什么。
slimmer 是名词，不是 slim 的比较级。
She is a slimmer.
她是个减肥者。
Many slimmers check food labels.
许多减肥者查看食品标签。
who 引导定语从句修饰 slimmer。
A slimmer who exercises regularly will see results.
经常锻炼的减肥者会看到效果。
Not this
She is slimmer.
Use this
She is a slimmer.
表达“减肥者”时 slimmer 是可数名词，前面需要冠词 a；不加 a 时 slimmer 是形容词比较级“更苗条”，词性和意思都不对。
Not this
Many slimmer go to the gym.
Use this
Many slimmers go to the gym.
slimmer 是可数名词，在 many 后面要用复数形式 slimmers；汉语名词没有复数变化，所以容易漏掉 -s。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
年度减肥冠军
She was named Slimmer of the Year after losing 30 kilograms.
她减掉30公斤后被评为年度减肥冠军。
减肥成功者
The article profiles successful slimmers who have kept the weight off.
这篇文章介绍了减肥成功并能保持体重的人。
意志坚定的减肥者
The determined slimmer exercised every morning and lost weight steadily.
这位意志坚定的减肥者每天早上锻炼，体重稳步下降。
反复减肥的人
As a serial slimmer, he had tried every diet in the book.
作为一个反复减肥的人，他尝试过书中所有的节食方法。
Use slimmers naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 slim（苗条）和 -er（人）连起来：减肥者就是努力让自己变 slim 的人。
语域：neutral 常见场景：slimming clubs、weight-loss programmes、health and fitness articles slimmer 作名词时通常指通过节食或运动来减肥的人，多用于英国英语，常见于减肥俱乐部、健康杂志或日常交谈等场景，语气中性，不算正式或俚语。
以上词均与 slimmer 押韵：重读元音 /ɪ/ 和其后的 /mə(r)/ 相同。注意拼写上相似的 timer /ˈtaɪmə(r)/ 和 climber /ˈklaɪmə(r)/ 并不押韵，它们的元音是 /aɪ/。
Dictionary facts from ECDICT, WIKTIONARY.