a serious matter.

It's no joke when a virus eats your computer files.

Related vocabulary: no laughing matter

• make a mess of
• make a mess of something
• make a mockery of
• make a mockery of something
• make a monkey of
• make a monkey of someone
• make a monkey out of
• make a monkey out of someone
• make a mountain out of a molehill
• make a move
• make a move on
• make a move on someone
• make a name for
• make a name for yourself
• make an ass of
• make an ass of yourself
• make an example of
• make an example of someone
• make an exhibition of
• make an exhibition of yourself
• make an honest woman of
• make an honest woman of someone
• make a night of it
• make a noise about
• make a noise about something