...acortarse, to slacken, abate, diminish... 
Gustavo Adolfo Becquer 「Legends, Tales and Poems」
... Indeed, I did not slacken till Ihad put a good mile between me and those uncanny cliffs...
John Buchan 「Prester John」
...After that the track began to rise, and the grade grew so steep that even Ismail, the furious, had to slacken pace...
Talbot Mundy 「King--of the Khyber Rifles」
...It is essential that the arc should slacken and the hook unbend, without the least possibility of their returning to a state of tension...
J. Henri Fabre 「More Hunting Wasps」
...The "Peach Blossoms" and "Buff Arches" slacken at abouthalf-past nine, and do not reappear until exactly the same lightreappears in the morning, going on well into the daylight...
Montagu Browne 「Practical Taxidermy」
...By the long discipline of ritual man accustomed himselfto slacken his hold on action, and be content with a shadowy counterfeitpractice...
Jane Ellen Harrison 「Ancient Art and Ritual」
...If, however, we gradually slacken the speed at which we are making thestone whirl, a moment will come at length when the string will becomelimp, and the stone will fall back towards our hand...
Cecil G. Dolmage 「Astronomy of To-day」
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repentance archipelago frock
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