What does the word stiffen mean?

Usage examples for stiffen

  1. The fact is that the tastes are never so tolerant, so liberal, so generous, so supple as they are at that time of life when they begin, according to your notion, to stiffen, to harden, to contract. – Imaginary Interviews by W. D. Howells
  2. I felt Godfrey's hand stiffen on my arm. – The Gloved Hand by Burton E. Stevenson
  3. The girl's eyes of scornful enquiry made her stiffen instinctively. – The Bars of Iron by Ethel May Dell