When two ride together one must ride behind.

Joint action does not always allow both people to take the lead. If they are to move in the same direction, one may need to accept a following role.

The proverb can also point to a broader imbalance in a partnership: cooperation may require someone to yield, even when both people have a stake in the undertaking.

Use it when discussing who will lead a shared effort or why one participant must defer to another. It can describe a practical arrangement or express discomfort with an unequal one.