Rashi on Genesis
תשמע חלום לפתר אותו — means thou payest heed to and UNDERSTANDEST A DREAM TO INTERPRET IT.
Rashbam on Genesis
תשמע חלום, you understand a dream and are able to explain its meaning.
Sforno on Genesis
תשמע חלום לפתור אותו, that you understand the principles involved in dreams so that you can use your knowledge to interpret them, not just by a haphazard guess.