► be seen/regarded as essential· These measures are seen as essential for national security.
► you should have seen somebody’s face (=used to say that someone was very angry, surprised etc)· You should have seen his face when I told him that I was resigning.
► seen a ghost
He looked as if he’d seen a ghost (=he looked very frightened). ► risk being seen/caught/arrested etc
Workers who broke the strike risked being attacked when they left the factory. ► not a soul in sight/not a soul to be seen
The night was dark and still, and there was not a soul in sight.