来自拉丁语 solus,单独的，唯一的，词源不详。可能来自 se,自己，来自 PIE*swo,自身，词源 同 self,solitary.引申比喻义全权处理的。

来自拉丁语 solum,脚掌，底部，基础，词源同 soil,大地，陆地。后也用于指一种可食用的比 目鱼，因其形如脚掌而得名。

sole

sole: English has three separate words sole, two of them closely related. Sole ‘underneath of the foot’ [14] comes via Old French sole from Vulgar Latin *sola, a descendant of Latin solea ‘sandal, sill’ (a possible relative of English sill). And this in turn was derived from Latin solum ‘ground, sole of the foot’ (a possible contributor to English soil). Sole ‘flatfish’ [14] was independently borrowed from Old French sole in the sense ‘flatfish’, a metaphorical extension based on the similarity in shape between the fish and the sole of the foot. Sole ‘only’ [14] comes via Old French soul (ancestor of modern French seul ‘only, sole’) from Latin sōlus ‘alone, single’.

The origins of this are uncertain, but it may be related to the pronoun sē ‘oneself’, in which case it could mean etymologically ‘by oneself’. Its other contributions to English include desolate [14], soliloquy [17], solitary [14], solo [17] (via Italian), and sullen.
=> sill; desolate, solitary, solo, sullen

sole (n.1)

"bottom of the foot" ("technically, the planta, corresponding to the palm of the hand," Century Dictionary), early 14c., from Old French sole, from Vulgar Latin *sola, from Latin solea "sandal, bottom of a shoe; a flatfish," from solum "bottom, ground, foundation, lowest point of a thing" (hence "sole of the foot"), a word of uncertain origin. In English, the meaning "bottom of a shoe or boot" is from late 14c.

sole (adj.)

"single, alone, having no husband or wife; one and only, singular, unique," late 14c., from Old French soul "only, alone, just," from Latin solus "alone, only, single, sole; forsaken; extraordinary," of unknown origin, perhaps related to se "oneself," from PIE reflexive root *swo- (see so).

sole (n.2)

common European flatfish, mid-13c., from Old French sole, from Latin solea "a kind of flatfish," originally "sandal" (see sole (n.1)); so called from resemblance of the fish to a flat shoe.

sole (v.)

"furnish (a shoe) with a sole," 1560s, from sole (n.1). Related: Soled; soling.

1. I wear my old shoes every day. One sole has come unglued.

我每天都穿那双旧鞋，有一只鞋底已经脱胶了。

来自柯林斯例句

2. The current sole superpower is far from being a disinterested observer.

当前唯一的超级大国远不是一个公正的旁观者。

来自柯林斯例句

3. Rafferty was the sole survivor from the successful Ireland team of 1988.

拉弗蒂是1988年红极一时的爱尔兰队硕果仅存的球员。

来自柯林斯例句

4. The plaintiff's sole witness, a gambler and layabout, was easily discredited.

原告唯一的证人嗜赌成性，游手好闲，其证词一下子就被推翻了。

来自柯林斯例句

5. He was the sole proprietor with total management control.

他是唯一业主，掌握全部管理权。

来自柯林斯例句