Jack is a real couch potato .he is gained fifty pounds

What does it mean couch potato?
الحل بعد اسبوع مع ايديم جديدة والحين تعاونو على الحل   

hi ramadan i think it means that he spends alot of time  sitting and watching TV  شلوني معاك    

يعطيك الف عافية roro
انتهى السبوع بدري

ok that's good
Idiom #2
Be careful whenever Jack offers to help you with your reports.he
can be a walf in sheep's clothing
WHat does mean a walf in sheep's cothing

i think it means ... a snaky or foxy person  
go on nice topic ...

Ramadan may i put the next idiom ?
Idiom 3#
"Last night I was telling a joke, and I really put my foot in my mouth. I had no idea I was talking about Rob's wife."

what does the man mean by: " I really put my foot in my mouth"?

[align=center]I think it means  , to say something embarrassingly stupid
Is it right naim_k    [/align]

correct
what is next ?

[align=center]Idiom #4
The new couple will make beatiful music together
What does mean make beatiful music together[/align]

hello ramadan i think it means to play music or sing
is it correct??? thank u for this beautiful subjecy