to boast

• 我不是夸口，真是这样。

  I'm not boasting, it really happened like that.

• 他有时也喜欢夸一下口。

  Sometimes he likes to boast.

• 这没有什么可以夸口的。

  This is not something to boast about.

• 这可不是夸口，我们一定能完成任务。

  We're not just boasting, we can definitely finish the job.