A thrust reverser system for a turbine engine, comprising: a support structure configured to be mounted to the engine; a transcowl mounted on the support structure and having an inner surface, the transcowl axially translatable, relative to the support structure, between a first position, in which the transcowl abuts the support structure, and a second position, in which the transcowl is displaced from the support structure to form an aperture between the transcowl and the support structure; a door pivotally coupled to the turbine engine, the door having a forward edge and an aft edge, the door rotatable between a stowed position and a deployed position when the transcowl translates between the first position and the second position, respectively, the door configured, when it is in the deployed position, to redirect engine airflow through the aperture to thereby generate reverse thrust; and an anti-rotation structure extending from the transcowl and disposed adjacent the aft edge of the door when the transcowl is in the first position and the door is in the stowed position, the anti-rotation structure configured to form an interference fit with the door when the door is in the stowed position, such that door rotation out of the stowed position can only occur subsequent to or concurrently with translation of the transcowl out of the first position when a clearance is provided between the anti-rotation structure and the aft edge of the door that allows the door rotation out of the stowed position; wherein the anti-rotation structure is formed as a separable component attached to the transcowl; wherein the transcowl includes a portion that is contoured to flare radially outwardly and then extend radially inwardly; and the anti-rotation structure comprises a structural segment coupled to the inner surface of the transcowl, the structural segment having an aft end and a forward end, the aft end coupled to the inner surface aft of where the transcowl extends radially inwardly, the forward end disposed forward of where the transcowl extends radially inwardly, to thereby form a door retention cavity. a support structure configured to be mounted to the engine; a transcowl mounted on the support structure and having an inner surface, the transcowl axially translatable, relative to the support structure, between a first position, in which the transcowl abuts the support structure, and a second position, in which the transcowl is displaced from the support structure to form an aperture between the transcowl and the support structure; a door pivotally coupled to the turbine engine, the door having a forward edge and an aft edge, the door rotatable between a stowed position and a deployed position when the transcowl translates between the first position and the second position, respectively, the door configured, when it is in the deployed position, to redirect engine airflow through the aperture to thereby generate reverse thrust; and an anti-rotation structure extending from the transcowl and disposed adjacent the aft edge of the door when the transcowl is in the first position and the door is in the stowed position, the anti-rotation structure configured to form an interference fit with the door when the door is in the stowed position, such that door rotation out of the stowed position can only occur subsequent to or concurrently with translation of the transcowl out of the first position when a clearance is provided between the anti-rotation structure and the aft edge of the door that allows the door rotation out of the stowed position; wherein the anti-rotation structure is formed as a separable component attached to the transcowl; wherein the transcowl includes a portion that is contoured to flare radially outwardly and then extend radially inwardly; and the anti-rotation structure comprises a structural segment coupled to the inner surface of the transcowl, the structural segment having an aft end and a forward end, the aft end coupled to the inner surface aft of where the transcowl extends radially inwardly, the forward end disposed forward of where the transcowl extends radially inwardly, to thereby form a door retention cavity.