You intentionally underexpose the film when you shoot, pretending that it has a higher ASA rating than it actually does.
You then increase the time and/or the temperature when developing the film, to compensate for the underexposure. You end up with a correctly-exposed image, but at the cost of extra grain, extra contrast, etc.
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You intentionally underexpose the film when you shoot, pretending that it has a higher ASA rating than it actually does.
You then increase the time and/or the temperature when developing the film, to compensate for the underexposure. You end up with a correctly-exposed image, but at the cost of extra grain, extra contrast, etc.