This can mean evening or dinner
Same with 아침. Breakfast or morning.
Usually by itself 저녁 will mean evening, if you say 저녁밥 it will often mean dinner (literally evening meal/rice)
I personally never say 저녁밥. 저녁 is enough.
So would you say something like 전녁을 먹어요?
Yes, that's acceptable. Also saying 아침을 먹어요 is acceptable in place of 아침밥 or 아침식사.
When they prononce 저 녁 , can we hear the ㄱ at the end?