how to understand "wear my heart on my sleeve" I checked out some webs and it turned out to be two kinds of meanings in general,one is open my heart,the other is you say so but you don't think in the same way actually,also duplicity.Can someone help me out?Thanks in advance.

“lady bone killer”？？

Some "weird" expression 1."sally on the side" 2."see a shark on a mountaintop" these lines are from Game of Thrones S1E4 & S1E5,help me out and I'll be grateful.1.Sam:"I know for a fact that some of the officers go to that brothel in Mole's Town."Snow:"I wouldn't doubt it."Sam:"Don't you think it's a little bit unfair,making us take our vows while they sneak out for a little sally on the side?"Snow:"Sally on the side?" 2.Lannisters:"I saw the youngest of the Greyjoy lad at Winterfell.It was like seeing a shark on a mountaintop." and both comes from S1E4,33:51 and 38:50

“cardinal,main,primary,prime"differences and how to use properly? show me as many details as possible,also,list some antonym and synonym would be better.

"subtract,mitigate,alleviate,reduce"show me the differences among them,as specific as possible i just wonder how and in what situation to use these words,which is more of common expression and which is more likely to be regarded as formal method.Please tell me more and i would be very grateful.

'buy a paddle',what does it mean? I saw these words in Breaking Bad S4E4,the subtitle translation group translate it as"vanish“,kind of like that meaning.Is it correct?