倒背如流

• 亻(person; human; man)RADICAL
• 到(arrive; reach)PHONO-SEMANTIC

A person who falls down to the ground has reached their final destination.

• 北(north)PHONETIC
• ⺼(flesh; body)RADICAL

The back is the meat on the rear side, like facing north with your back turned away from the sun.

• 女(woman; female)RADICAL
• 口(mouth; speech)ASSOCIATIVE

A woman using words that comply with others' wishes is what 如 (like, as if) means.

• 氵(water)RADICAL
• 㐬(swirling flow; whirlpool)PHONETIC

Water flowing in a whirlpool becomes a stream, which is the circulation of water.