"Deserting under fire" is a term used to describe when a soldier abandons their post during combat. There are various synonyms for this phrase, each conveying a slightly different meaning. "Abandoning one's responsibilities" is a phrase that can be used to describe a soldier who leaves their duty during a critical moment. "Retreat" suggests a strategic withdrawal from enemy fire. "Cowardice" implies a lack of bravery or courage in the face of danger. "Fleeing the scene" might be appropriate when describing someone who is running away from a dangerous situation. Regardless of which term is used, deserting under fire is a serious offense that can result in severe consequences for the soldier.