be sharp
Examples
Between childhood, boyhood, adolescence and manhood (maturity) there should be sharp lines drawn with tests, deaths, feats, rites, stories, songs, and judgments.
The tool that is so dull that you cannot cut yourself on it is not likely to be sharp enough to be either useful or helpful.
memories should be sharp when one has nothing else to live for.
And for the season it was winter, and they that know the winters of that country know them to be sharp and violent, and subject to cruel and fierce storms.
My dad was into the 1950s doo-wop era. If you look at those groups, or at James Brown, Jackie Wilson and the Temptations in the 1960s, you'll see you had to be sharp onstage.
A band due to an OH group tends to be sharp.