When in a situation that requires immediate assistance, there are many alternatives to the phrase "call for aid". Depending on the severity of the situation, other synonymous phrases can be used to convey the urgency of the matter. Some examples include, "request assistance", "signal for help", "summon emergency services", "alert authorities", or "mobilize rescue teams". These variations can help to communicate the need for prompt and urgent assistance when it is necessary. It is important to know these synonyms and be able to articulate them appropriately in case of an emergency.