In The following lines from 'the Japanese Quince' by John Galsworthy :
he drew several deep breaths but they augmented rather than diminished the sensation - as of some sweetish liquor in course within him, together with a faint aching just above his heart.
I can't make sense of the part where it says "in course within him". I dont know what it means. I already looked up the definitions of 'course' in 2 different dictionaries so please cease from suggesting just that !