The distressing explanation she had to make to Harriet, and all that poor Harriet would be suffering, with the awkwardness of future meetings, the difficulties of continuing or discontinuing the acquaintance, of subduing feelings, concealing resentment, and avoiding eclat, were enough to occupy her in most unmirthful reflections some time longer, and she went to bed at last with nothing settled but the conviction of her having blundered most dreadfully.
— Rousing from reflection, therefore, and subduing her emotion, she turned to Harriet again, and, in a more inviting accent, renewed the conversation; for as to the subject which had first introduced it, the wonderful story of Jane Fairfax, that was quite sunk and lost.
There are no more uses of "subdue" identified with this meaning, but check unspecified meaning below.
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She was threatening people with a knife, but police used a Taser to subdue her.
The two ladies looked over it together; and he sat smiling and talking to them the whole time, in a voice a little subdued, but very audible to every body.
If I had followed her judgment, and subdued my spirits to the level of what she deemed proper, I should have escaped the greatest unhappiness I have ever known.
As long as Mr. Knightley remained with them, Emma’s fever continued; but when he was gone, she began to be a little tranquillised and subdued—and in the course of the sleepless night, which was the tax for such an evening, she found one or two such very serious points to consider, as made her feel, that even her happiness must have some alloy.
Her arm was pressed again, as he added, in a more broken and subdued accent, "The feelings of the warmest friendship—Indignation—Abominable scoundrel!