(Australia, intransitive, slang) To start eating with gusto.
He closed the door and motioned them to a tray. `Bog in, it's all on the house.' 1951, Dymphna Cusack, Florence James, Come In Spinner, page 385:
(Australia, intransitive, slang) To tackle a task vigorously.
The soldiers swept into the trench with a cheer! Some of the Turks remained to argue the point with the Australians, but the bulk of them ran squealing, for fear of being stuck, like pigs, to the second trench. Those Turks who stopped to argue, argue no more. `Advance, Australia!' resounded through the bushes. `Into the cows! Bog in, boys, bog in!' 1916, John Butler Cooper, Coo-oo-ee!, page 262:
(passive, transitive, usually) To halt the progress of.
The vehicle then got bogged in by tidal movements, Sgt Sears said. 2008 December 16, Bonnie Malkin, “Man survives nine days stuck in Australian Outback”, in Daily Telegraph:
North of the Alps, you can have heat and sun--but some summers (if you go far enough north) you can also be bogged in by rain and enough chill that you have to go out and buy wool hats. 2000 February 16, Douglas W. Hoyt, “Family's first trip to Europe...please help!”, in rec.travel.europe (Usenet):
I hope that they aren’t too bogged in with the snow. 2010, Mary Ridgeway, How Brave the Irish Heart, AuthorHouse, →ISBN, page 69: