1. 打喷嚏
    When you sneeze, you suddenly take in your breath and then blow it down your nose noisily without being able to stop yourself, for example because you have a cold.

    e.g. What exactly happens when we sneeze?...
           我们打喷嚏究竟是怎么回事？
    e.g. See your doctor now to beat summer sneezing.
           马上去看病，把花粉过敏引起的打喷嚏治好。

2. 不容忽视;值得拥有
    If you say that something is not to be sneezed at, you mean that it is worth having.

    e.g. The money's not to be sneezed at.
           别把这笔钱不当回事。