do someone's dags en · NOUN
Etymology
From darings.
Meanings
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(UK, obsolete, plural, plural-only, slang) To defy someone by doing something that they are unable to do.
[…] do his dags for him, Billy would, if he could get at him. Wouldn't you, Billy?
1914, William De Morgan, When Ghost Meets Ghost, page 575:"Can you climb?" asked Gale of Joe. "Like a monkey." "Of course," said Gale, drily, "very much like a monkey." "That's one to you; but I can do your dags." "You can't." "I can — anybody's dags. Look here."
1880, Our Boys' Paper, page 411: