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floss one's teeth [verb]
floss 作动词时，宾语常为 teeth；口语中也可直接说 floss。
You should floss your teeth twice a day.
你应该每天用牙线清洁牙齿两次。
绣花丝线；绣花线
先理解核心含义，再看它在真实句子里的用法。
绣花丝线；绣花线
a soft loosely twisted thread used in embroidery
You should floss your teeth twice a day.
你应该每天用牙线清洁牙齿两次。
用于清洁牙缝的线。
A thread used to clean the gaps between the teeth.
搅炼炉中铁液上漂浮的玻璃态物质,由氧化物和土类玻璃化而成。
Fluid glass floating on iron in the puddling furnace, produced by the vitrification of oxides and earths which are present.
生丝纤维。
Raw silk fibres.
玉米芯等表面的纤维；某些植物(如豆类)壳内的松软绒毛状物质。
The fibres covering a corncob etc.; the loose downy or silky material inside the husks of certain plants, such as beans.
I floss my teeth every night before I go to bed.
我每天晚上睡觉前都用牙线清洁牙齿。
She was flossing her teeth in the bathroom when I called her.
我给她打电话时，她正在浴室里用牙线剔牙。
The embroidery pattern calls for six strands of floss.
这个刺绣图案需要六股绣花丝线。
floss 作动词时，宾语常为 teeth；口语中也可直接说 floss。
You should floss your teeth twice a day.
你应该每天用牙线清洁牙齿两次。
floss 作名词时为不可数名词，a strand of floss 表示“一根绣花线”。
A single strand of floss is enough for this stitch.
绣这一针用一根绣花线就够了。
Not this
I need to buy a floss.
Use this
I need to buy some floss.
floss 作“牙线”讲时是不可数名词，不能用 a 修饰；用 some 或 a box of floss 等量词来表达。
Not this
You should floss your tooth after every meal.
Use this
You should floss your teeth after every meal.
floss 作动词表示用牙线清洁牙齿时，习惯上宾语用复数 teeth，因为清洁的是牙齿之间的多个缝隙；单数 tooth 只指一颗牙，不符合这一动作的常规表达。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
牙线
She bought a new pack of dental floss.
她买了一包新的牙线。
绣花线
She used red embroidery floss to sew the design.
她用红色绣花线缝制图案。
用牙线清洁牙齿
Remember to floss your teeth before brushing.
记得刷牙前用牙线清洁牙齿。
每天用牙线清洁
The dentist told me to floss daily.
牙医告诉我每天用牙线清洁。
饭后用牙线
He always flosses after meals to remove food particles.
他总是饭后用牙线清除食物残渣。
你不需要给所有的牙齿都清理牙缝，只要清理你想留下的那些就行。
This humorous dental motto is a well-known English saying, often shared by dentists and featured on oral health posters to remind people to floss daily.
这句幽默的牙科格言是英语中的知名说法，牙医常会分享，也常出现在口腔健康海报上，用来提醒人们每天使用牙线。
Use floss naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：floss 里藏着 loss（失去），不用牙线剔牙会失去牙齿；丝线滑过牙缝，也像绣花线一样轻。
语域：neutral 常见场景：embroidery / sewing、dental care 通常，floss 作名词时指绣花线或丝棉，多用于手工、刺绣或缝纫类语境；作动词时表示用牙线清洁牙齿，多用于日常口腔护理场合。两种用法语体都比较中性，正式与非正式场景均可使用。
这些词都与 floss 押韵，重读音节都是 /ɒs/：loss, gloss, moss, toss, cross, boss。注意 gross 虽然也以 -oss 结尾，但读作 /ɡrəʊs/，与 floss 不押韵。
Dictionary facts from ECDICT, WIKTIONARY.