pull in one's horns or draw in one's horns {v. phr.}, {informal}
He said he could beat any man there single-handed, but he pulled in his horns when Jack came forward.
After the business failed, Father had to pull in his horns.
As one advances in years, it is prudent to pull in one's horns more and more as to physical activity. Categories: {informal} {v. phr.}