/ ˈdɒdl; NAmE ˈdɑːdl/ noun
[ sing. ] ( BrE , informal ) a task or an activity that is very easy
SYN cinch :
The first year of the course was an absolute doddle.
The machine is a doddle to set up and use.
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WORD ORIGIN
1930s: perhaps from dialect doddle toddle , of unknown origin.