Look at Koichi's meaningful look!
Do you understand what these eyes imply?
"I thought you were smarter than that." "Hey what’s that supposed to mean?"
The flavor of an idea, what is that? Imagine yourself licking an idea to figure out what it tastes like. What do you think you'll be tasting? Probably the meaning of said idea.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.