Slacian
Bosworth & Toller Anglo-Saxon Old English Dictionary - slacian
According to the Old English Dictionary:
slæcian, sleacian;
- slacian
- p. ode To slacken, relax an effort :-- Gif hé lithwón slacode . . . his handa ne slacedon sin autem paululum remisisset . . . factum est, ut manus illius non lassaréntur, Ex. 17, 11, 12. Ðæt ne ða sleacgiendan (pigritantes) hé ofhreóse, Hymn. Surt. 18, 15. [Nullich neuer slakien to drien herd wiðuten, A. R. 134, 22. Ne schaltu seon me slakien to leuen. Jul. 26, 1. He mot slakie his bendes. Laym. 23345 (and MS. ). Cf. Icel. slakna to get slack.]