What does "dress" mean?

dress down

  1. to scold severely; reprimand
  2. to wear casual clothes to an activity, job, etc. that ordinarily requires more formal dress

dress ship

to raise the ensign at each masthead and the flagstaff and, often, string signal flags over the mastheads from bow to stern

dress up

  1. to dress in formal clothes, or in clothes more elegant, showy, etc. than one usually wears
  2. to improve the appearance of, as by decorating

See dress in American Heritage Dictionary 4 Idioms

dress ship

Nautical
To display the ensign, signal flags, and bunting on a ship.

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