The phrase "first cracks" has several synonyms, including "initial signs," "preliminary indications," and "early symptoms." These terms all refer to the first or earliest indications of a problem or issue. Other synonyms for "first cracks" include "warning signs," "small clues," and "incipient problems." These terms can be used to describe anything from a developing health issue to an impending crisis in a business or organization. By identifying and paying attention to these early warning signs, individuals or groups can take proactive steps to address potential problems before they escalate into more serious issues.