To treat in such a way as to destroy undesirable properties; for example, neutralization of an acid by the addition of an alkali.

To add a strong deoxidizer, such as silicon or aluminum, to molten steel in order to stop the reaction between carbon and oxygen forming gaseous carbon monoxide and dioxide during solidification.

1. In drilling, to prevent well blowout by appropriate measures.

2. In oil production, to halt well production so that reconditioning of the well may proceed.