"Wear one's heart on one's sleeve"是什么意思？

1）Dime a dozen -Tony was not concerned that his apples spoiled since they were a dime a dozen -The football coach said that hardworking players were rare, while lazy players were a dime a dozen. -Unskilled laborers in developing countries are a dime a dozen Definition: Something cheap and common. Etymology: Derived from early America, when a dime could buy you a dozen fruits, or other items 2）Wear his heart on his sleeve -Alexander wore his heart on his sleeve by getting a tattoo of his girlfriend's name -Wesley wore his heart on his sleeve by singing a song to his fiance on Valentine's day. -Roger loved his football team, and wore his heart on his sleeve by wearing the football jersey everyday Definition: Very open about feelings Etymology: In Medieval times, Knights would joust. But they would need to show chivalry. Often their lady would tie a hankerchief representing the colors of her house on his sleeve. Since his heart belonged to her. We would say he wore his heart on his sleeve 3）Stick to your guns -Gary stuck to his guns and supported his innocent friend in a murder trial -Zach stuck to his guns and asked Katherine out until she said yes. -Melanie stuck to her guns and stayed in her hometown while her friends moved away Definition: persistent Etymology: Comes from American pioneers who defended their right to bear arms