air cut
n.— «In recent years, Suzuki has gained recognition for his unique cutting technique called the “air cut” in which he snips off “unnecessary portions” of a person’s hair resulting in a haircut that not only looks good, but is easier and quicker to style at home.» —“D.I.Y. styling” by S. Indramalar Malaysia Star Jan. 12, 2009. (source: Double-Tongued Dictionary)
Further reading
Susan from Virginia Beach, Virginia, shares the phrase her mother used when the kids refused to eat: It’ll grow hair on your back teeth. This supposed motivator likely blends two older traditions: a German idiom, Haare auf den Zähnen haben...
To describe something tiny or insignificant compared with something vast, you might reach for phrases like a drop in the ocean or a drop in the bucket. In Mandarin, there’s an equally picturesque phrase that translates as nine cows, one hair, 九 牛 一...