Example sentences of "and set off the [noun] " in BNC.

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1 All went well until about half way through the demonstration when fumes from some hot oil wafted into the smoke detector above the hob and set off the hotel 's fire alarm .
2 Police sources said it was the detonator — with a small package of Semtex at its core — which failed to ignite and set off the bags of nitrate-based fertiliser which were packed into the rear of the van .
3 Half way through the meal Taff produced a bottle of red wine scrounged from H.Q It certainly tasted good and set off the meal .
4 Her face now against a tweed back , she fought for breath , struggled and pushed , moaning as another icy drop flowed down her body and set off the pain .
5 and set off the smoke-alarm
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