working hard, as busy as a beaver When the foreman returned, the workers were hard at it.
HARD AT IT
Meaning of HARD AT IT in English
English idioms vocab. Словарь английских идиом и выражений. 2012
working hard, as busy as a beaver When the foreman returned, the workers were hard at it.
English idioms vocab. Словарь английских идиом и выражений. 2012