- 大白天 dàbáitiān broad daylightdaytime; broad daylight (used for emphasis)
- 白天鹅 báitiān'é whooper swana species of swan with a long neck, white feathers, and a yellow bill; it is capable of long-distance migration and typically lives in lakes and ponds
- 乳白天空 rǔbáitiānkōng whiteoutweather condition where visibility and contrast are severely reduced by snow or clouds
- 白天托管 báitiāntuōguǎn day caredaytime child care or nursery services