Definition of rough tongue in English:

rough tongue

noun

  • The habit of speaking rudely:

    ‘he was known as a jovial fellow but was not without a vicious temper and a rough tongue’
    • ‘My father often chided my rough tongue and inelegant writing - but I digress.’
    • ‘Looming large in these pages is the figure of the poet's father, whose rough tongue maintains its influence.’