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それも

それもsoremoneutral

and at that — sharpens what was just said with one telling detail

昨日きのう、三時間さんじかんも待またされたんだ。それも、外そとで立たったまま。

kinou, sanjikan mo matasareta n da. soremo, soto de tatta mama.

I was kept waiting three whole hours yesterday. Standing outside, at that. casual

彼女かのじょは一人ひとりで山やまに登のぼったそうです。それも、冬ふゆの富士山ふじさんに。

kanojo wa hitori de yama ni nobotta sou desu. soremo, fuyu no fujisan ni.

Apparently she climbed a mountain alone. Mount Fuji in winter, no less. neutral

All examples3

and at that, not just any — the detail that lands the point

  1. 昨日きのう、三時間さんじかんも待またされたんだ。それも、外そとで立たったまま。

    kinou, sanjikan mo matasareta n da. soremo, soto de tatta mama.

    I was kept waiting three whole hours yesterday. Standing outside, at that. casual

  2. 彼女かのじょは一人ひとりで山やまに登のぼったそうです。それも、冬ふゆの富士山ふじさんに。

    kanojo wa hitori de yama ni nobotta sou desu. soremo, fuyu no fujisan ni.

    Apparently she climbed a mountain alone. Mount Fuji in winter, no less. neutral

  3. 予約よやくが三件さんけんも重かさなってしまいました。それも、すべて同おなじ日ひの午後ごごです。

    yoyaku ga sanken mo kasanatte shimaimashita. soremo, subete onaji hi no gogo desu.

    Three bookings ended up overlapping. All of them on the same afternoon, no less. neutral

How it's formed1

Notes

What follows それも is often a bare phrase, not a finished sentence
(…それも、外そとで立たったまま。).