Lower Lip
Bottom Lip
noun
The bottom lip is your lower lip or bottom lip.
したくちびる is the vocab reading for 下 and the reading you learned with the kanji for 唇. This is how you'd usually read this word.
かしん is very technical and it's rarely used outside of scientific writing. If you don't plan to read science papers in Japanese, you can ignore this reading!
赤ちゃんは、木綿のミトンをしていたにも関わらず、下唇を引っ掻いてしまった。
Even though the baby was wearing cotton mittens, he still scratched his lower lip.
「お金が無いから、今週は外食出来ないの。」と言って、瞳は下唇をかんだ。
"I can’t eat out this week because I’m broke." Hitomi said, biting her bottom lip.
古代鮫ヘリコプリオン、とにかく下唇がすごいから、一度ググってみて！
The bottom lip of the ancient shark Helicoprion is just amazing. You should Google it!