There are several synonyms for the phrase "preparations for defense." One common synonym is "defense measures," which refers to actions taken to protect oneself or one's country from potential attacks or threats. Another synonym is "security arrangements," which encompasses various strategies and protocols designed to ensure safety and protection. "Preparedness activities" is also a synonymous phrase, which implies readiness and planning in the face of potential danger. Finally, "defensive strategies" may be used as a synonym, which refers to the planning and implementation of tactics aimed at preventing or mitigating the impact of potential threats. Regardless of the specific phrase used, these synonyms all point to the essential need for taking proactive steps towards defense and security.