KanjiJLPT N4
Machine / Mechanism

loom, mechanism, machine, airplane, opportunity, potency, efficacy, occasion

Mnemonic

A tree wonders how many centuries it has stood here. One day its trunk cracks open, revealing an intricate Machine / Mechanism of wooden gears inside. How many gears? One for every growth ring in the tree — each year added another cog to the mechanism.
Additional thoughts
Picture an ancient tree whose rings are literal wooden gears. The older the tree, the more complex the clockwork hidden in its trunk. Tree + how many rings = machine.
Quick recall
A tree cracks open — How many wooden gears spin inside this living Machine / Mechanism?

Details

The keyword for 機 is machine / mechanism. This kanji refers to devices, apparatus, or mechanical contrivances, encompassing both literal machines and more abstract notions of systems and functions that operate in an organized manner. It also carries the sense of an opportunity or critical moment, as in the pivotal turning point of a mechanism clicking into place. By extension, it can refer to the inner workings or essential function of something, whether physical or conceptual.
On'yomi
Kun'yomi
はた