make or become stronger or more resilient
he tried to toughen his son up by sending him to public school
a falcon has scaly skin on its legs that toughens up very quickly
Today’s NYT Connections Answers Mar 28, #291 - Daily Updates & Hints
Today’s Wordle Answer Mar 28 #1013- NYT Wordle Hints & Updates
NYT Mini Crossword Answers Today - The Mini for Mar 28 Solved