1. I've been so busy I haven't had a square meal in three days.
2. They haven't had a square meal for four or five days.
3. She hadn't had a square meal for days.
4. He looks as though he hasn't had a square meal for weeks.
5. We haven't had a square meal for a week.
6. He looks as though he hasn't had a square meal for months, ie looks underfed.
7. I have not had a good square meal for a fortnight, I am living nuts.
8. If you're only eating a chocolate bar for lunch, you need a good square meal in the evening.
9. Indeed he often gave them whatever was in the till, feeling they looked in need of a square meal.