Eating too much sugar can bring it on, too, causing a rebound effect of low blood sugar.
For this part — and for all the "bring it on" bravado of his speech, and the cocooned defiance of his conference — Mr. Cameron would surely prefer Mr. Brown to "bottle it", as Mr. Osborne put it.
The Sun says Sir Alex Ferguson roared 'bring it on' at the thought of facing an English side in the Champions League last eight. "It could well happen - and I would really enjoy that, " he said.
"Dead or alive," "bring it on," "either you're with us or you're against us" : the tenor of official rhetoric in the ensuing years embodied a kind of desperate machismo.
