Entry 2 senses · 2 variants Webster, 1913 Backsliding · Back·slid·ing · IPA /bˈækslˌaɪdɪŋ/ a. n. 01 a. Slipping back; falling back into sin or error; sinning. 1. Slipping back; falling back into sin or error; sinning. “Turn, O backsliding children, saith the Lord.” — Jer. iii. 14. 02 n. The act of one who backslides; abandonment of faith or duty. 1. The act of one who backslides; abandonment of faith or duty. “Our backslidings are many.” — Jer. xiv. 7.