Lowness and decline with

conveys the meanings of low or to decrease in terms of position, degree, or value.

Etymology

This kanji is a phono-semantic compound comprised of 亻 (person) and 氐 (bottom)

Decrease

(Decline)

低下(ていか) means a decline or drop in value, level, quality, or degree.

It combines 低 (low) with 下 (down) to show something going downward.

Manga panel from よつばと! showing example of Declining stamina with 低下.
よつばと! » Volume 1 » Page 13

Jumbo helps his friend Yousuke move into his new house. After unboxing things, Yousuke stops for a break.

葉介(ようすけ):
「なんか(おれ) 体力(たいりょく)低下(ていか)してんなあ… ()がふるふる…」
“Man, I feel like my stamina is dropping... My hands are shaking...”
ジャンボ:
「おまえさ 近所(きんじょ)にあいさつで(くば)粗品(そしな)とか用意(ようい)してるか?」
“Hey, are you preparing any little gifts to hand out to your neighbors when you go around saying hello?”
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