  We study the evolution of an elastic string into the pinned state at driving
forces slightly below the depinning threshold force $F_c$. We quantify the
temporal evolution of the string by an {\it activity function} $A(t)$
representing the fraction of active nodes at time $t$ and find three distinct
dynamic regimes. There is an initial stage of fast decay of the activity; in
the second, intermediate, regime, an exponential decay of activity is observed;
and, eventually, the fast collapse of the string towards its final pinned state
results in an decay in the activity with $\Am \sim (t_p-t)^{\psi}$, where $t_p$
is the pinning time in the finite system involved.
