a. (UN-1 7 b.)
1627. Jackson, Creed, VI. x. § 1. That God did set the course of nature a-going with an irresistible and unretractable swinge.
1900. Omond, Romantic Triumph, iv. 276. The lucidus ordo of his [Comtes] central conception is a possession for ever, an unretractable gift to France and to the world.