杀草快

• 乂(cut; eliminate)PHONETIC
• 木(wood; tree)ASSOCIATIVE

Using a weapon to chop into wood creates the image of killing and destruction.

• 艹(grass; herb)RADICAL
• 早(early; morning)PHONETIC

Grass grows abundantly in the early morning dew across the fields.

• 忄(heart; mind)RADICAL
• 夬(resolute; decisive)PHONO-SEMANTIC

A resolute and decisive mindset without hesitation is the feeling of joy and nimbleness.