the female side or line of descent of a family; distaff side (opposed to spear side).
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How to use spindle side in a sentence
Stevenson came from the Balfours of Pilrig, and was of gentle blood, on the spindle side.The Works of Robert Louis Stevenson - Swanston Edition | Robert Louis Stevenson
Of course Mr. Bancroft will take the male pupils, and Mrs. Bancroft will instruct "the spindle side."