We have no meanings for "slacken perceptibly" in our records yet.
1 The fury of the storm continued unabated for perhaps half an hour, and then began to slacken perceptibly .
2 To their amazement, however, the speed began to slacken perceptibly after they had left the city ten or twelve miles behind.
3 When he got within the gates of Upper Town, his pace slackened perceptibly .
4 The Scharnhorst caught fire forward, but not seriously, and her fire slackened perceptibly .
5 Denny could, too, I knew, because in those moments, Denny's tension slackened perceptibly .
6 At this moment the besiegers' fire, which had slackened perceptibly , was re-opened with redoubled strength.
7 I don't want to break your neck, Landover, but if you don't give in, I'll-I'll -Thepressure slackened perceptibly .
8 The Scharnhorst caught fire forward, but not seriously, and her fire slackened perceptibly ; the Gneisenau was badly hit by the Inflexible.
9 An hour passed, during which the pace slackened perceptibly , and then with only ten miles to go, two more dogs laid down.
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