(1)
concede = (人が)...を(正しいと)(しぶしぶ)認める.
(2)
unwind = (巻いた{もつれた}もの)を{から}ほどく<{from}.(はねなど)をゆるめるwind
(3)
clean slate =スレ-ト色[濃い青味がかった灰色}石板(昔筆記の為に用いた
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Stopped raining, open the door, a comfortable air come into the room.
Flowers of the Potted plants on the balcony look freshly.