Present participle for to toughen up, or to make physically stronger or more resistant
“Finally, the sheet was taken to a kiln, where it was annealed to toughen the glass.”
Present participle for to fortify or make more secure
“The group aims to toughen the defenses of Europe's northeastern flank against military incursions.”
Present participle for to cause to be callous or unfeeling
“He had failed his son, had failed to toughen him to the world, to drive a steel spike through his center so that he could stand up for himself.”
Present participle for to make, or to become, harsher or more severe
“Their rejection comes despite plans in England, unveiled last week, to toughen the law, giving householders the right to take on burglars without fear of prosecution.”
Present participle for to get, or make, accustomed to a given condition or situation
Present participle for to make rough or coarse
The action of strengthening the defenses or security of
Adaptation and familiarity due to repeated exposure, habituation, acclimatization, or seasoning
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