Similar words: day after day, day, all day, one day, today, the other day, yesterday, night and day.
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1. What's done by night appears by day. 
2. What is done by night appears by day.
3. Cover your head by day as much as you will, by night as much as you can.
4. Water dropping day by day wears the hardest rock away.
5. Things go on day by day.
6. They sleep by day and hunt by night.
7. They work during the night and sleep by day.
8. Activists are increasing in number day by day.
9. Day by day the structure heightened.
10. We travelled at night and rested by day.
10. Wish you can benefit from our online sentence dictionary and make progress every day!
11. Day by day he became weaker.
12. Day by day the disappointed lover peaked and pined.
13. We travelled by night and rested by day.
14. The fugitives travelled by night andrested by day.
15. She sleeps by day and works by night.
16. By day he worked downtown for American Standard.
17. Day by day the situation is improving.
18. They're improving day by day.
19. I prefer travelling by day.
20. Owls usually sleep by day and hunt by night.
21. Competition is getting hotter day by day.
22. Day by day he grew weaker.
23. Day by day she learnt more about her job.
24. The old man's health dwindled slowly day by day.
25. Nocturnal animals sleep by day and hunt by night.
26. Her health was improving day by day.
27. Day by day his condition improved.
28. He amends day by day.
29. I live for the moment, day by day, not for the past.
30. We will muddle through and just play it day by day.
More similar words: day after day, day, all day, one day, today, the other day, yesterday, night and day, day and night.