「両手で掴んだまま口を広げる」、あるいはもっとひどい表現としては「両手で大きく掴んだまま口をくいしばって陰茎を切る」というものもあるが、これはまさに、被験者または目撃者が吸う音や歯を食いしばる様子を描写している。耐え難い苦痛に耐えながら唇をすぼめ歯を食いしばってすする、吸う動作や音、またはお茶やコ ーヒーなど非常に熱いものをカップから音を立ててすすったり吸ったりしているとき、あるいは何かを吸って一服しているときを指す。中国人は、誰かが殴られたり、鞭で打たれたり、殴られたり、あるいは誰かが得点を数えるために口をくいしばっているのを見たときに、同じ声を出した。西洋では、ホッケーの試合中に激しいボディチェックを見たり、賞金付き試合でノックアウトパンチを見たりしたときに、「ああ、痛いだろうね、ジーン」と言って、唇をすぼめて息を吸ったり吐いたりするかもしれないことに注意してほしい…ここでも同じ考え方だ。
歯ぎしりとそれに関連する問題や恐怖は、次の象形文字に表れています。
そして：「歯 齒 恨 艮 仡 旡 兂 邪 拑 音 既 既 茱 萸 飢 啗 啖 猖 惕 𣇄 晣 惮 憚 喫 吃 喫 揕 意 貇 虞 鉗 𪗱 齟 𪘚 齬 齭」歯が原因で痛みを感じる。

「Mouth as prick is reamed while grabbed in two hands」or more hideous perhaps as「mouth used to cut prick by clenching while held big in two hands」but aptly describes a SUCKING SOUND, TEETH CLENCHING by the subject, or any witnesses. Refers to the sipping, sucking action and sound of pursed lips and clenched teeth in excruciating agony, or while noisily slurping or sucking something extremely hot from a cup, such as tea or coffee, or smoking something and taking a hit. The Chinese made the same sound when they witnessed someone else get whacked or whipped, or taking a hit, or when someone's mouth clenched on a tally. Note that in the West, you might say「ooooh, that's gotta hurt, Gene」and breathe in or out through pursed lips if witnessing a tough body check during a hockey game, or a knockout punch in a prizefight…same idea here.
　CLENCHING and related problems and fears are present in these glyphs:
　歯 and 齒 as teeth.
　恨 regret, hate, resentment, rueful, hold a grudge, malice, bitter feeling, rancor, to curse and swear.
　艮 chewing.
　仡 being fed up with conditions and bravely doing something about it while unafraid of the consequences.
　旡 suddenly choking on something in one's throat.
　兂 clasped with teeth.
　邪 wickedly demonic.
　拑 pinning with clenched teeth.
　音 loud noise.
　既 and 既 too late, happened already, unchangeable.
　茱 and 萸 bloody stump, dogwood.
　飢 ravenously chomping meat.
　啗 enticing lure, gnawing meat.
　啖 threaten a superior, taunt and torment, reckless endangerment while tasting and eating.
　猖 ferocious and insane, mad, reckless, not following the rules.
　惕 healthy respect of danger.
　𣇄 and 晣 biting off a chunk, bent by tonguing mouth.
　惮 and 憚 fear, dread, shirking, shrunk.
　喫 clenching with gasps.
　吃 and 喫 extirpate, destroy utterly.
　揕 bare-fisted jab, punch in the face.
　意 long in thought, intent, concerns.
　貇 tenaciously clenching jaw and not letting go.
　虞 horror, terror, terrorism.
　鉗 clamp and gag.
　𪗱 and 齟 discord, broken teeth.
　𪘚 and 齬 gritting one's teeth, great hatred.
　齭 pain caused by teeth.

Modern definitions (that generally disregard history) …excluding politically incorrect concepts and other meanings deemed offensive today; may list only pigeonholed definitions, euphemisms, or meaninglless mnemonics)
Chinese: variant of 吃
Japanese: to smoke, to breathe in, to inhale, to suck, to sip, to slurp, to absorb, to soak up, to kiss, to eat, to drink, to suffer, to receive, to take, to receive a blow
Unihan extended: eat; drink; suffer, endure, bear
EDRDG: consume; eat; drink; smoke; receive (a blow)