Definition of up to one's (old) tricks in English:

up to one's (old) tricks

phrase

informal
  • Misbehaving in a characteristic way.

    • ‘So the little chap, helped by his obliging Washington buddies, is up to his old tricks again.’
    • ‘It appears that the Devil is up to his old tricks again.’
    • ‘After the 1997 handover, the western imperialists were up to their tricks.’
    • ‘The evidence is that Denis is up to his old tricks.’
    • ‘Now the council are saying that I've been up to my old tricks again and that I've turned this place into a tip.’
    • ‘‘Could it be,’ asks Lewis, ‘that the statisticians are up to their tricks again and are overestimating the price falls that are actually occurring?’’
    • ‘It couldn't last, of course, and no sooner had the blockades been called off than they were up to their old tricks of putting up the prices while they thought nobody was looking.’
    • ‘But, Algernon is definitely up to his tricks again today, even though I haven't seen him.’
    • ‘Mr Gray said: ‘It is an utter disgrace, and shows Labour are still up to their old tricks of spinning.’’
    • ‘I wonder if these companies are up to their old tricks?’