Possible Results:
estaba arqueando
-I was arching
Imperfect progressive yo conjugation of arquear.
Imperfect progressive él/ella/usted conjugation of arquear.

arquear

Sí, pero entonces habría entrado en la habitación y te habría informado de que el paciente estaba arqueando extrañamente su espalda contra la cama.
Yes, but then I would have come into the room and reported that the patient was weirdly arching his back off the bed.
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