Manaʻo: A single person might seem insignificant, but they may be the one thing keeping those above them from falling. They are the support needed to sustain a superior. They are a gear that without them, a machine would cease to work.
There is much else that can be reflected upon with regard to this proverb. One person may be small but they could be what holds a family together. An employee may be just one, but without them an entire organization could crumble. Just one person standing up in a situation could be all it takes to stop a harm from happening or a bad plan from being executed. I see this phrase as a valuing of the individual and an encouragement to believe in oneself despite feeling "small."