随插即用

• 阝(earthen mound; village; hamlet)RADICAL
• 迶(follow; accompany (in sound))PHONETIC

Following someone else through villages and neighborhoods is the meaning of the character 随.

• 扌(hand)RADICAL
• 臿(shovel; spade)PHONETIC

Using your hand to grip a plum and push it down into the earth is the action of inserting or wedging something in.

• 卩(kneeling person)RADICAL
• 𠤎(bowl of rice full (pictographic))ASSOCIATIVE

A person kneeling and bowing down to a full bowl of rice depicts the image of immediate approach.

• 用(use; utilize)ASSOCIATIVE

A bucket with a handle is what people pick up and use every day.