to make a feeling, an idea, etc. stronger
The experience reinforced my sense of loss.
Such jokes tend to reinforce gender stereotypes.
The climate of political confusion has only reinforced the country's economic decline.
Success in the talks will reinforce his reputation as an international statesman.
to make a structure or material stronger, especially by adding another material to it
All buildings are now reinforced to withstand earthquakes.
reinforced plastic/steel/concrete
The door was built of oak, heavily reinforced with iron.
to send more people or equipment in order to make an army, etc. stronger
The UN has undertaken to reinforce its military presence along the borders.