Select the most appropriate meaning of the given underlined Idiom:-

To win medal in coming Olympic games wrestlers are working "Day in and day out" 

Every day without any change, continuously 

The most appropriate meaning of the underlined idiom "day in and day out" is every day without any change, continuously. The idiom comes from the idea of someone working or doing something every day, without any breaks or changes. In a figurative sense, to say that someone is working "day in and day out" means that they are working very hard and consistently.

The other options are not as accurate descriptions of the meaning of the idiom. A difficult road to travel is not the same as working every day. To remain calm in difficult circumstances is not typically associated with the idiom "day in and day out." To criticize someone all the time is not typically associated with the idiom "day in and day out."