Definition of "cack"

[…] for on occasions he gives utterance to an entirely uncharacteristic series of cacking notes, and even mounts high in the tree to sing a hesitating medley of the same unmusical cacks, broken whistled calls, and attempted trills.

1916, Frank Michler Chapman, Handbook of Birds of Eastern North America‎, page 493

Still fluffy with down, she often attacks the other birds, cacking and flashing her wings, or threatens me as I watch through the tiny peephole of the near box.

1990, P. H. Liotta, Learning to Fly‎, page 32

While the Gyrfalcon cacked loudly on each stoop, the owl did not scream.

2000, Minnesota Ornithologists′ Union, The Loon, Volumes 72-74, page 37

Peckle snitted them off and cacked at them. Then he flew up by the rope-tie spot and puffed out his chest and then the wrens made another dash for the scraps and he dove down and cacked them away.

2007, Turk Allcott, Time Leak‎, page 63

‘I asked him once if he got nervous before doing it,’ says Astin, ‘and he said he was absolutely cacking himself before going on stage, but as soon as he got there it was fantastic.’

2005, M. J. Simpson, Hitchhiker: A Biography of Douglas Adams‎, page 322

[…] through the open door, now directly below his feet, and nearly cacked his breeks when the stretcher skidded slightly on the shiny metal floor.

2010, Tony Doyle, Flying at the Edge: 20 Years of Front-Line and Display Flying in the Cold War Era, Pen and Sword, page 356

Another distinction she reported: my brother once cacked his pants and responded with the words, "It will never happen again" – and it didn't, […]

2010, Julian Barnes, Nothing to be Frightened Of, Vintage Canada, page 68

He smelled the ferrous oxide of blood and the farmyard stench of shit. He'd cacked it. He was empty and he'd cacked his load. The brushman came over, lisping slightly […]

2016, Nicholas Blincoe, Jello Salad, Canelo

Hans Bach gave him a look, and he cacked his pants and hurried off.

2018, B. de Paul, When Angels Rise