YOU SAID:
You make me weak in the knees
INTO JAPANESE
あなたは私を膝に弱くします
BACK INTO ENGLISH
You make me weak on my knees
INTO JAPANESE
あなたは私の膝を弱くする
BACK INTO ENGLISH
You weaken my knees
INTO JAPANESE
あなたは私の膝を弱めます
BACK INTO ENGLISH
You weaken my knees
Okay, I get it, you like Translation Party.