Definition of be no joke in English:

be no joke

phrase

informal
  • Be a serious matter or difficult undertaking.

    ‘trying to shop with three children in tow is no joke’
    • ‘Her father's life was at stake, and that was no joke.’
    • ‘But denominational discrimination was no joke in those days.’
    • ‘He said: ‘I was chased for 16 miles yesterday and it was no joke, I can tell you.’’
    • ‘No one is laughing, Bertie, because driving at 95 mph is no joke.’
    • ‘To me that is no joke, should be taken seriously, and, I believe, is a vile form of self-expression.’
    • ‘The parents exchanged glances; this was no joke.’
    • ‘We were really shocked when we found out that it was no joke.’
    • ‘I was reprimanded as she told me this was no joke.’
    • ‘Having our principal industry in decline is no joke.’
    • ‘Driving round York, particularly at rush hour, is no joke.’