  We evaluate the contribution to the nucleon-nucleon interaction due to
correlated $\pi\rho$ exchange in the $\pi$, $\omega$, and $A_1$/$H_1$ channels
by means of dispersion-theoretic methods based on a realistic meson exchange
model for the interaction between $\pi$ and $\rho$ mesons. These processes have
substantial effects: In the pionic channel it counterbalances the suppression
generated by a soft $\pi NN$ form factor of monopole type with a cutoff mass of
about 1 GeV; in the $\omega$-channel it provides nearly half of the empirical
repulsion, leaving little room for explicit quark-gluon effects.
