Decorated with daisies or having the appearance of daisies.
From 'daisy' (from Old English 'dægesēage' meaning 'day's eye') plus the suffix '-ed' indicating a state or quality.
Daisies got their name because their flower heads close at night and open during the day—literally the 'eye of the day'! So calling something 'daised' means it looks like it's covered with these flowers that were named after their daily routine.
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