To criticize something severely, or to move a camera across a scene, or to search for gold by washing dirt in a pan.
The criticism sense comes from slang meaning 'to judge unfavorably.' The camera sense comes from 'pan' as a wide field of view. The gold sense comes from using a pan as a tool.
Gold miners literally 'panned' for gold in streams, swirling dirt in metal pans until heavy gold sank to the bottom—one of the few words that connects manual labor directly to movie camera techniques!
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