Phrasal Verbs
to stay at a distance from someone or something Keep far back from the road.
to make a student repeat a year at school because of poor grades
to make someone stay at a distance from someone or something Barricades were erected to keep back the crowds.
to prevent a feeling, etc. from being expressed synonym restrain She was unable to keep back her tears.
to refuse to tell someone something I'm sure she's keeping something back from us.