but what

phrase

: that … not

—used to indicate possibility or uncertainty

I don't know but what I will go.

Examples of but what in a Sentence

Recent Examples on the Web

Soda lovers might be able to taste the difference between diet and zero-sugar, but what is the actual difference between the carb-free drinks? — Lindsey Desoto, HEALTH, 4 Aug. 2026

The difference is no longer just what can be observed—but what can be verified. — Gamuda Contributor, Forbes.com, 4 Aug. 2026

Of course everyone wants lower property taxes, but what is missing is how that will happen. — Chicago Tribune, 3 Aug. 2026

Planting for a Single Season A spectacular spring and summer garden is wonderful, but what about the rest of the year? — Megan Hughes, Better Homes & Gardens, 2 Aug. 2026

Word History

First Known Use

1545, in the meaning defined above

Rhymes for but what

• abut
• catgut
• chesnut
• chestnut
• donut
• doughnut
• groundnut
• haircut
• hindgut
• midgut
• precut
• rebut