The dissociation of phosgene gas (${\mathrm{COCl}}_2$) is represented as follows:

${\mathrm{COCl}}_2\left(\mathrm{g}\right) \rightleftharpoons \mathrm{CO}\left(\mathrm{g}\right)+{\mathrm{Cl}}_2\left(\mathrm{g}\right)$

When a mixture of $\mathrm{CO}, {\mathrm{Cl}}_2$ and ${\mathrm{COCl}}_2$ gases at equilibrium is compressed at constant temperature, what will happen to the amount of $\mathrm{CO}$ in the mixture?