Definition of but adverb from the Oxford Advanced American Dictionary

 

but

 adverb
adverb
NAmE//bət//
 
, NAmE//bʌt//
 
 
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only He was but a shadow of his former self after the accident. There were a lot of famous people there: Tom Hanks and Julia Roberts, to name but two.
See the Oxford Advanced Learner's Dictionary entry: but