IPA: /ˈblækən/
KK: /ˈblækən/
To change in color to dark or black, often due to burning or decay.
The sky began to blacken as the storm approached.
Past: blackened
Past Participle: blackened
To make something black or to cover it with a dark color.
The chef decided to blacken the fish before serving it.
Past: blackened
Past Participle: blackened
Blacken → It is formed from "black" (from Old English "blæc", meaning dark or the color black) and "-en" (a suffix used to form verbs indicating to cause to become). The word "blacken" means to cause something to become black or dark.
Think of the word 'black' meaning dark, and the suffix '-en' indicating a change, so to blacken means to make something dark.