different between upskirted vs unskirted

English

upskirted

un- +? skirted

unskirted (not comparable)

Without a skirt.
(rare) Not skirted or surrounded.
- 1869, New Monthly Magazine (volume 145, page 23)
  For some time the banks were unskirted by timber, but presently the wind's force was lessened by the intervention of a few bushes […]

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