scab over
主语通常是伤口、擦伤一类的词，over 表示表面被痂盖住。
The scrape on his knee scabbed over after a few days.
他膝盖上的擦伤几天后就结痂了。
结痂
scabs — third person singular of scab
结痂脱落；形成痂皮脱落；刮除（…的）部分表面；去除部分表层；当工贼；破坏罢工；长满痂；结痂。；结痂并脱落,如受损或病变的皮肤。
to become covered with a scab or scabs; to form a scab
长满痂；结痂。
To become covered by a scab or scabs.
结痂并脱落,如受损或病变的皮肤。
To form into scabs and be shed, as damaged or diseased skin.
从表面去除一部分；刮除表面部分。
To remove part of a surface (from).
形成结痂
form a scab
充当破坏罢工者
To act as a strikebreaker.
一般现在时
The wound scabs over quickly.
伤口很快结痂。
一般过去时
The cut scabbed after a few days.
几天后伤口结痂了。
规则动词，意为'结痂'
The cut on my finger scabbed over after a few days.
我手指上的伤口几天后就结痂了。
用法提示：动词scabbed表示伤口形成痂
AI contextual example
Don't pick at the wound while it's scabbing.
伤口结痂时不要抠它。
用法提示：动名词scabbing表示正在结痂的过程
AI contextual example
His knee scabbed quickly after he scraped it on the pavement.
他的膝盖在人行道上擦伤后很快就结痂了。
用法提示：动词scabbed描述结痂的完成状态
AI contextual example
主语通常是伤口、擦伤一类的词，over 表示表面被痂盖住。
The scrape on his knee scabbed over after a few days.
他膝盖上的擦伤几天后就结痂了。
强调结痂后的状态，常用 be scabbed over 的形式。
By the third day the burn was scabbed over.
到第三天，烫伤处已经结痂了。
此义指罢工时替罢工者上班、上班顶替。
Several workers scabbed during the strike.
罢工期间有几名工人顶替上工。
比 scab 通用，强调表面形成硬壳；scab 还可指充当破坏罢工者，该用法不可替换。
grammar · medium
易错句子The cut on his knee scabbed on after two days.
正确表达The cut on his knee scabbed over after two days.
动词 scab 表示伤口结痂时，常用搭配是 scab over，over 表示痂皮覆盖伤口表面；scab on 不是英语中确立的搭配，学习者受汉语“在……上”影响容易误加 on。
grammar · medium
易错句子The scab on his arm stayed for years after the wound healed.
正确表达The scar on his arm stayed for years after the wound healed.
scab 指伤口愈合过程中暂时形成、随后脱落的痂；scar 指愈合后长期留下的疤痕。伤口愈合后多年仍在的是 scar，不是 scab；汉语“痂”和“疤”的区分也对应这一点。
grammar · medium
易错句子The wound is scabing over nicely.
正确表达The wound is scabbing over nicely.
scab 是重读闭音节且以“元音字母 + 辅音字母”结尾，加 -ing 时需双写末尾的 b，变为 scabbing；scabing 不符合英语拼写规则。
此处针对 scab 的“充当破坏罢工者”义，反义词为 strike（罢工）。
scab 指伤口表面形成、之后会脱落的痂，动词常与 over 连用（scab over）；scar 指伤口愈合后留下较长期或永久的疤痕，不表示临时结痂。两者都可用于伤口愈合语境，但 scab 更强调结痂这一过程，scar 更强调留下疤痕的结果。
scab 专指伤口结痂，痂皮通常会脱落；crust 泛指表面结成硬壳或硬皮，可用于伤口，也可用于面包、雪地等，范围更广。伤口语境中 crust over 也可能出现，但不如 scab over 具体。
结痂
The wound on his knee scabbed over in a few days.
他膝上的伤口几天内就结痂了。
在罢工中当工贼；破坏罢工
A few workers scabbed on the strike to avoid losing their jobs.
少数工人为了不丢工作而在罢工中当了工贼。
与scab（结痂）同属伤口愈合过程，结痂是伤口表面形成的保护层。
scab（结痂）是愈合过程中的一个阶段。
损伤后皮肤可能结痂（scab）。
结痂是皮肤恢复过程中的常见现象。
结痂与血液凝结相关，痂通常由凝结的血液和渗出物形成。
结痂；表面愈合
The wound on my knee has finally scabbed over.
我膝盖上的伤口终于结痂了。
工贼是一种两条腿的动物，有着螺丝锥般的灵魂、浸满水的脑袋，以及用果冻和胶水拼成的脊梁骨。
This is Jack London's famous definition from his 1903 essay 'The Scab'; the insulting description is still widely quoted in discussions of labor strikes and strikebreaking.
这是杰克·伦敦1903年文章《工贼》中的著名定义；这段带有侮辱性的描述至今仍被广泛引用在关于罢工和破坏罢工行为的讨论中。
Dictionary facts from ECDICT, WIKTIONARY.