IPA: /ˈblækɪŋ/
KK: /ˈblækɪŋ/
A substance used to make something black, often in the form of a polish or paste.
He applied the blacking to his shoes to make them shine.
Blackening is formed from "black" (from Old English "blæc", meaning dark or the color black) and the suffix "-ing" (indicating the action or process of). The word "blacking" refers to the process of making something black or darkening it.
Think of the word 'black' which means dark, and the '-ing' shows it's the action of making something dark. This helps you remember that 'blacking' is the act of darkening something.