LIST I
Phrases

LIST II
Meanings

 A. I had so much work to do but the fever got the best of me

 I. Peaceful time

 B. They spent their halcyon days in a village

 II. Vulnerable/Weak spot

 C. He earned really well but ended up penniless. Gambling was his achilles heel  

 III. Competent for a work

 D. A doctor worth his salt will advise people for healthy eating

 IV. take advantage of something