The heart break someone's heart = upset someone greatly: "She broke his heart when she left him." learn something off by heart = learn something completely: "I've learnt this off by heart - I'm bound to pass the exam!" you're all heart! = when you tell someone sarcastically how kind they are: "Thanks for giving me all this work - you're all heart!" hand on heart = promise with sincerity: "Hand on heart, it's the honest truth." have the heart = be able to give someone bad news: "I didn't have the heart to tell him he'd failed." a heart of gold = be a very kind person: "She'll always help - she has a heart of gold." Hands hand over = pass on something: "Before I leave, I have to hand over all my work." get out of hand = become impossible to manage: "You'll have to deal with this problem before it gets out of hand." know something like the back of your hand = know something extremely well: "He knows London like the back of his hand." have your hands full = be very busy: "I can't do anything about it now - my hands are full." in hand = under control: "The company report is in hand - you'll have it next week." live hand to mouth = only earn enough money for food: "After he lost his job, he had to live hand to mouth for a couple of months." give someone a hand = help someone: "He always gives me a hand with the housework." have someone in the palm of your hand = have influence over someone: "He's got her in the palm of his hand." be caught red-handed = be caught doing something bad: "The children were caught red-handed picking the flowers." Fingers butter fingers = be clumsy and drop things: "You've dropped my vase! Butter fingers!" keep your fingers crossed = wish something for someone: "Keep your fingers crossed for me tomorrow - it's my job interview." under your thumb = control someone: "She's got him under her thumb - he won't do anything without asking her first." Arms twist someone's arm = persuade someone: "I didn't want to go out, but he twisted my arm." cost an arm and a leg = cost a fortune: "The car cost an arm and a leg - it'll take them ages to pay back the loan." Feet and legs put your foot in it = say or do something you shouldn't: "I think I've put my foot in it - I told her about the party." have itchy feet = not able to settle down in one place: "She's going off travelling again - she's got really itchy feet." keep someone on their toes = keep someone alert: "Our teacher keeps us on our toes - we have to pay attention in class." stand on your own two feet = be independent: "I don't need your help - I can stand on my own two feet." have two left feet = be awkward or clumsy: "He's a terrible dancer - he's got two left feet!" walk on eggshells = be careful about what you say or do: "She's in a terrible mood - you'll have to walk on eggshells around her." foot the bill = pay the bill: "He had to foot the bill for the party." The back go behind someone's back = do something secretly: "She went behind my back and told my boss I wanted a new job." back off = stop trying to force someone to do something: "Will you just back off and let me decide what I should do!" back down = accept defeat: "He finally backed down and let me buy a pet rabbit." back someone up = support someone: "Thank you for backing me up in the meeting." put your back into something = work very hard at something: "She put her back into it and got good results." stab someone in the back = betray someone: "Be careful of him - he'll stab you in the back if it gets him what he wants."