KanjiJLPT N1
Lick

lick, lap up, burn up, taste, undergo, underrate, despise

Mnemonic

Your family name is literally on the tip of your tongue — because your clan's ancient tradition requires you to lick a sacred stone to prove your lineage. Only those bearing the true family name can taste the hidden flavor when their tongue touches the relic.
Additional thoughts
Picture a bloodline ritual: a tongue pressed against an old carved stone. If you carry the right family name, the stone tastes sweet. The act of licking IS the proof of identity.
Quick recall
Your family name is proven when your tongue licks the sacred stone.

Details

The keyword for 舐 is lick. This kanji refers to the action of running one's tongue over something, just as an animal or person might lick a surface, food, or a wound. It conveys the physical act of tasting or moistening with the tongue, and can also be used figuratively to suggest treating someone or something with contempt, as in the expression of "licking" someone by looking down on them.
On'yomi
Kun'yomi
ねぶ.る、な.める

Used in vocab