Malbim Ayelet HaShachar Klal 486
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[תחת, מטה] : "תחת" הוא שם מצטרף נגד העליון אשר עליו, אבל "מטה" יאמר בבחינת עצמו.
Ayelet Hashachar, translated by Betzalel Avraham Feinstein, 2021
תחת (under) and מטה (down) - תחת is a preposition which refers to something that is below that which is on top of it, butמטה will be said in terms of itself.
וכשבא שם "תחת" על המקום מציין המקום המונח תחת המתקומם. (תזריק סימן קח)
Ayelet Hashachar, translated by Betzalel Avraham Feinstein, 2021
And when the word תחת refers to a place, it indicates the place which rests under that which is standing.