(idiomatic)

(art) A style of painting having abrupt transitions between areas of (often plain) color.

plural of hard-edge painting

(transitive) To affect somebody badly.

(simile, archaic) Very callous or hardhearted.

(simile, humorous) Very difficult.

(idiomatic, informal) To cause difficulty or make trouble for someone. / (idiomatic, informal) To tease, kid or rib someone.

(idiomatic) In a difficult and inescapable position. / (idiomatic) Having the choice between two unpleasant or distasteful options; in a predicament or quandary.

(idiomatic) Established habits are difficult to change.

To acquire knowledge through failure or any other undesirable experience.