The first observation of the energy distribution of electrons emitted from solids bombarded by MeV atom clusters is reported. In the backward direction, using graphite and Si bombarded by C-n(+) and Al-n(+). (n <= 8), an appreciable suppression of electron emission has been observed at electron energies lower than similar to 10 eV. Electron yield per atom decreases with increasing n, and becomes less than 50% at n >= 3, relative to the case of n = 1. The experimental results cannot be explained in terms of projectile stopping cross sections nor by the clearing-the-way effect. It is probable that the suppressed electron emission is a result of the suppression of the transport or surface transmission of the produced low-energy electrons, rather than of the suppression of ionization.