When someone is taken into custody by law enforcement officers, they are commonly described as "under arrest." However, there are several other words and phrases that can be used to describe this situation. One such phrase is "in custody," which indicates that the person is being held by law enforcement officers but has not yet been charged with a crime. Another phrase that is commonly used is "detained," which is similar to "arrested" but does not necessarily imply that the person has committed a crime. Other synonyms for "under arrest" include "apprehended," "captured," and "seized." Ultimately, all of these phrases describe the process of taking someone into custody for questioning or further legal action.