Douglas Harper's Etymology Dictionary
Wiktionary
n. A slight correction or adjustment.
Usage examples of "touch-up".
He could see Peter, Tina, and Sorge wrapped in discussion over at the monitors, Everett was waiting out of shot with his touch-up kit, and everyone not actually working was gathered to one side, watching.
She popped over whenever she wished, ostensibly to check on the small patch of landscaping in front, or to make sure no repair work or touch-ups were needed, or to bring Brazil homemade banana bread or cookies and to inquire about his job and personal life.
Firstly there was a compact tool kit which contained a keyhole saw and hand drill, drill bits and augers, a box of hearing-aid batteries for the detonator and torch batteries for the transmitter, a Penlite torch, a five-hundred-foot roll of thin electrical wire, diamond glass-cutters, putty, staples and tiny one-ounce tins of touch-up paint.