I’m in the middle of eating a meal, so I’ll call you back later.
Please relax and enjoy your meal!
If you could only have one meal every day for the rest of your life, what would you choose?
The action of eating is when you have your meal.
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.