KanjiJLPT N1
Consign

consign, requesting, entrusting with, pretend, hint

Mnemonic

You write desperate words on parchment, bind the letter with a tuft of your hair as proof of identity, and consign it to a rider heading into the storm. That tuft guarantees authenticity—whoever reads your words knows you entrusted this message with your life.
Additional thoughts
Picture a medieval noble cutting a tuft of hair, pressing it into hot wax on a scroll of words, then placing the bundle into a courier's hands. The physical token (tuft) plus the written plea (words) together form the act of consigning something precious to another's care.
Quick recall
Seal your words with a tuft of hair and consign the message to a trusted rider.

Details

The keyword for 託 is consign. This kanji conveys the idea of entrusting something to another person's care, handing over responsibility or a task to someone else. It carries the sense of placing one's trust in another, whether by delegating duties, leaving something in someone's keeping, or committing a matter to their charge. It is also used in the context of making requests or託ing one's wishes to others.
On'yomi
たく
Kun'yomi
かこつ.ける、かこ.つ、かこ.つける

Used in vocab