...Never for an instant did the child slacken hishowls as he punished the dog that was saving himfrom death... 
Albert Payson Terhune 「Lad: A Dog」
...Thefamiliar summons did not slacken nor swerve the stampede...
Albert Payson Terhune 「His Dog」
...Slowly, for their wild speed must slacken as it had been built up, byslow degrees...
Various 「Astounding Stories, May, 1931」
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