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general::
Phrase(s): stand at something
1. to stand in front of something; to stand in the vicinity of something. • I stood at the window, watching the traffic. • Tom stood at the door, counting people as they came in. 2. to stand or remain in a particular state, such as attention or readiness. • The troops stood at attention for a very long time. • The entire platoon is standing at readiness, awaiting further orders.
McGrawhill's American Idioms And Phrasal Verbs