洗劫一空

• 氵(water; liquid)RADICAL
• 先(before; lead)PHONO-SEMANTIC

Washing uses water going first to clean everything.

• 去(go; leave)PHONETIC
• 力(strength; power)RADICAL

Robbery is using strength to force someone to abandon their possessions.

• 一(first; number one (pictographic))ASSOCIATIVE

A single horizontal stroke symbolizes the number one, the beginning of all things.

• 穴(row; gap)RADICAL
• 工(craftsman; work)PHONETIC

An empty cave with nothing inside is just hollow space.