summon a witness

summon Verb

— If you summon someone, you call on him to appear before you. — If a police officer or other law enforcement official summons a person, he is accusing him of a crime but not arresting him, and instead demanding he appear in court to respond to the accusation.

a Determinative

— A is used when the following word could be any of a certain type. Compare "A book I saw on the shelf" and "The book I gave you yesterday".

a Noun

— A is the first letter of the alphabet. The letter "a" comes before "b". — In some schools, an A is a very high grade. Ron got an A on his earth science test.

witness Noun

— A witness is somebody who saw something, especially a crime. The journalist spent three years interviewing survivors and witnesses. The hospital has born witness to countless deaths and births. Police took signed statements from the witnesses. The state has no physical evidence and no witnesses. — A witness is somebody who tells a court what they know about a situation, especially a crime. The witness testified that Simpson was ill at the time. Dr. Yazdi, an expert witness, explained how somebody could have used the computer without the owner knowing. She was the key witness for the defense at the trial.

witness Verb

— If you witness something, you see it. She spoke of the terrible events she witnesses during the war. She witnessed some terrible events during the war. — If something witnesses something, it experiences it.