n.
1.a military operation (often involving new supplies of men and materiel) to strengthen a military force or aid in the performance of its mission
2.information that makes more forcible or convincing
3.(psychology) a stimulus that strengthens or weakens the behavior that produced it
4.a device designed to provide additional strength
5.an act performed to strengthen approved behavior
Idiom of the Day
use (someone or something) as an excuse
to blame someone or something for something
My friend used his busy schedule as an excuse not to help us.