IPA: /ˈtʌtʃʌp/
KK: /tʌtʃʌp/
The act of making small improvements or corrections to something, often to enhance its appearance or quality.
After the painting was done, we did a quick touchup to fix some areas that needed improvement.
Touchup → It is formed from "touch" (from Old English *tūcan*, meaning to come into contact with) and "up" (meaning to increase or improve). The word "touchup" refers to the act of improving or enhancing something by making minor adjustments or repairs.
Think of 'coming into contact' ('touch') to 'improve' ('up') something — that's what a touchup means.
No commonly confused words.