expression
I don't want to boast, but
A set phrase used to preface a statement that might sound boastful, often to soften the impact or show modesty.
自慢じゃないが、私は料理が得意だ。
I don't want to boast, but I'm good at cooking.
自慢じゃないが、彼はクラスで一番足が速い。
I don't mean to brag, but he's the fastest runner in the class.