Meaning of 糟糠妻 in Japanese

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Definition of 糟糠妻

つま(tsuma) 【妻 ·夫 ·具】

(n) wife
男は妻が車で駅で待つことにした。
The man decided to wait at the station until his wife came.
dear (formerly used by romantically linked men and women to refer to one another)
garnish (esp. one served with sashimi)
embellishment

そうこう(soukou) 【糟糠】