a contrapié

¡Llore usted lágrimas de sangre, Señor Comisario, y reconozca que lo han sorprendido a contrapié, gestionando con gran timidez el calendario de los certificados de exportación, cuando ésta nos es favorable!
Commissioner Fischler, you must admit your guilt, and admit that you were wrong to handle the calendar of export certificates so cautiously, when they were favourable to us!
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