Sentence:  In I 'll go with George dominant stress is probably on George ; but if George has just been mentioned prominently ( and the trip to be made has been under discussion ) , what is said is probably I 'll go with him , and dominant <WSD>stress</WSD> is probably on the preposition with . 
Meaning of the word marked with <WSD> tags:  the relative prominence of a syllable or musical note (especially with regard to stress or pitch)