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заниматься ерундой contraintes
génér.	screw around; potter; be busy with trifles; faff around (Anglophile); be busy with trifles
Игорь Миг	fight the moonlight; beat a dead horse
argot.	diddlybop; fooster (snowleopard); fanny about (Антонэл)
en d.	seek a lost elephant in an earthen pot (george serebryakov); seek a hare in a hen's nest (george serebryakov)
idiom.	milk a bull (You can pull and pull, but you can't milk a bull. VLZ_58); chase one's own tail (VLZ_58)
makar.	do piffling jobs; busy oneself with piffling jobs; potter about; potter away
trad.	fuck
Игорь Миг, registr.	fart around

заниматься ерундой: 2 phrases, 2 sujets

Américain usage, pas orthographe	1
Makarov	1