shirt 
/ˈʃɚt/ noun
plural shirts /ˈʃɚt/ noun [count] : a piece of clothing for the upper body that has sleeves and usually a collar and buttons down the front — see also nightshirt, polo shirt, stuffed shirt, sweatshirt, t-shirt, undershirt
keep your shirt on
informal — used to tell someone to calm down or be more patient ▪ “Aren't you ready yet?” “Keep your shirt on! I'll be ready in a minute.”
lose your shirt
chiefly US, informal : to lose a lot of money because of a bad bet or investment
▪ He lost his shirt betting on football games. ▪ Many investors lost their shirts when the market crashed.
▪ He lost his shirt betting on football games. ▪ Many investors lost their shirts when the market crashed.
put your shirt on
chiefly Brit, informal : to bet a lot of money on (someone or something)
▪ I put my shirt on a horse in the second race.
▪ I put my shirt on a horse in the second race.
the shirt off your back
informal ◊People who would give you the shirt off their back would do anything to help you.
▪ She'd give me the shirt off her back if I ever needed help.
▪ She'd give me the shirt off her back if I ever needed help.
