Mnemonic
You raise the flag on your mailbox for one reason: to deliver your outgoing package. That little flag stands tall, giving the postman a reason to stop and deliver your mail to its destination.
Additional thoughts
Picture a classic mailbox with its red flag raised high. The flag (尸) sits atop reason (由) in the kanji structure—the flag is the signal, and the reason beneath it is the purpose: delivery. One triggers the other.Quick recall
A flag raised for one reason: to deliver.Details
The keyword for 届 is deliver. This kanji conveys the idea of delivering, submitting, or reporting something to a destination or authority. It carries the sense of something reaching its intended recipient, whether that be a physical package arriving at a location or a formal notification or registration being submitted to an official body. It also implies the notion of something extending far enough to reach or arrive at a goal.
- On'yomi
- かい
- Kun'yomi
- とど.ける、-とど.け、とど.く