Bough-wough

—Aren't you sometimes frightened at being planted out here, with nobody to take care of you? —There's the tree in the middle —said the Rose—: what else is it good for? —But what could it do, if any danger came? —Alice asked. —It says “Bough-wough!" —cried a Daisy—: that's why its branches are called boughs! —Didn't you know THAT? —cried another Daisy, and here they all began shouting together, till the air seemed quite full of little shrill voices. (Lewis Carroll, Through The Looking Glass, chapter II)