1.
having an effect on sth :
She suspected that secret influences were at work.
2.
work (on sth) busy doing sth :
He is still at work on the painting.
Danger—men at work.
1.
having an effect on sth :
She suspected that secret influences were at work.
2.
work (on sth) busy doing sth :
He is still at work on the painting.
Danger—men at work.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005