If a man once fall, all will tread on him.

A single setback can leave a person exposed to scorn, exploitation, or further harm. Once someone is seen as weak or disgraced, others may take advantage rather than offer help.

The saying criticizes the tendency to abandon or oppress people when fortune turns against them. “Tread on” is figurative, referring to mistreatment or exploitation rather than literal trampling.

Use it when describing how a person’s first failure, loss of standing, or moment of weakness invites harsher treatment from others. Its wording is archaic and uses “man” in an older generic sense, so it is best presented as a traditional proverb or paraphrased in contemporary discussion.