Definition of all but
: very nearly : almost would be all but impossible
Examples of all but in a sentence
Without you the job would have been all but impossible.
We had all but given up hope.
First Known Use of all but
ALL BUT Defined for English Language Learners
Definition of all but for English Language Learners
: very nearly
ALL BUT Defined for Kids
Definition of all but for Students
: very nearly : almost “He is all but forgotten.” — William H. Armstrong, Sounder
Seen and Heard
What made you want to look up all but? Please tell us where you read or heard it (including the quote, if possible).