In extremis describes a situation where a person, entity or court is acting at the last possible moment, in conditions of acute urgency or imminent danger, leaving little or no time for reflection or ordinary procedures. It is a Latin expression of general legal usage rather than a defined statutory term, and is used consistently across England and Wales, Scotland, Northern Ireland and Ireland. In practice, it may arise in diverse contexts: for example, a deathbed will or codicil executed when the testator is close to death; emergency medical treatment decisions; last‑minute applications for interim injunctions or stays; or corporate actions taken immediately before insolvency. Courts may refer to a party or decision being made in extremis when assessing the weight to give to evidence, the validity of consent or intention, or the reasonableness of steps taken under severe time pressure. The fact that something was done in extremis does not in itself invalidate it, but it can be highly relevant to issues such as capacity, undue influence, procedural fairness, mitigation, and the availability of equitable relief or relief from sanctions.