The worst wheel of a cart creaks most.

A faulty wheel announces itself by making noise. The proverb suggests that conspicuous complaining may reveal a person's shortcomings rather than their importance.

It also warns against judging someone by how much attention they command. A person who speaks up most often is not necessarily the most capable or helpful.

Use this proverb when someone repeatedly complains or draws attention to themselves while contributing little. It can also remind listeners not to mistake a loud voice for sound judgment.