The crossword solution for the term 'imprison in wartime' is 'INTERN'. Interning is a practice of detaining people during times of war, usually without trial or due process. This practice has been used throughout history and is still used in some parts of the world today. Internment camps are often used to detain people who are perceived as a threat to national security or public safety. Internment can also be used to detain people who are suspected of committing a crime or are considered to be a political enemy.