A piece of cake Definition 1 of 1Pro Tip 1/3Informal Usage Use 'a piece of cake' in casual conversations rather than formal or academic settings. Making friends at the new school was a piece of cake. Pro Tip 2/3Cultural Nuance The phrase is very common in American English and understood in most English-speaking cultures. Getting the team to agree was a piece of cake. Pro Tip 3/3Positive Context Use it to express a task completed with ease, often conveying a positive tone. Organizing the event was a piece of cake, thanks to the volunteers.