The negative consequences of a person's actions eventually return to affect them; past misdeeds or errors produce retaliation, trouble, or punishment later on.
A warning that wrongdoing, negligence, or unwise behavior will ultimately result in retribution or harmful outcomes for the originator.
2.
Worldwideinformalidiomaticthreatening
Used as a threat or admonition implying that someone will face consequences for their actions in the near future.