eyelash

Compared meaning: eyelash, the hair on the eyelid (noun).

比较义项：睫毛（名词）。

• lash

  Informal, almost always plural ("lashes"); typical of beauty/cosmetics contexts (mascara, curling, extensions); the bare singular is rarely used.

  较为口语化，几乎总是以复数lashes出现；常见于美妆语境（睫毛膏、卷翘、接睫毛等）；单数形式很少单独使用。

  This new mascara promises to make your lashes look longer and fuller.

  这款新睫毛膏号称能让你的睫毛看起来更长更浓密。

• eyelash 本词

  The standard, neutral term for a single hair on the eyelid; natural in the singular ("an eyelash") as well as the plural, used in everyday speech without lash's beauty-industry flavor.

  指眼睑上一根毛发的标准、中性说法；单数（an eyelash）和复数都很自然，用于日常场合，没有lash那种美妆行业色彩。

  A single eyelash fell onto her cheek as she blinked.

  她眨眼时，一根睫毛掉在了脸颊上。

Both words mean eyelash. Lash is informal and almost always plural, common in beauty contexts like mascara, curling, or extensions; the singular form is rare. Eyelash is the standard, neutral word, natural in singular and plural, with no beauty-industry feel.

这两个词在这一义项上都指睫毛，但语域和用法不同：lash较为口语化，几乎总以复数lashes出现，常见于美妆语境（睫毛膏、卷翘、接睫毛等），单数形式很少单独使用；eyelash则是日常、无歧义的标准说法，单复数使用都很自然，没有lash那种美妆行业的色彩。这里不比较lash作动词时“抽打、鞭打”或“系紧、捆绑”等其他意思。