Backslide \Back"slide"\ (b[a^]k"sl[imac]d"; 277), v. i. [imp.
{Backslid}; p. p. {Backslidden}, {Backslid}; p. pr. & vb. n.
{Backsliding}.] [Back, adv. + slide.]
To slide back; to fall away; esp. to abandon gradually the
faith and practice of a religion that has been professed.
[1913 Webster]