entries → 忍不住
TSUMUGU · TOCFL 4 (est.) · 詞
忍不住 word · TOCFL 4 (est.)
忍不住 ＝ 忍 ＋ 不 ＋ 住
ㄖㄣˇ ㄅㄨˋ ㄓㄨˋ · rěnbùzhù
verb phrase — cannot hold it back; cannot help (doing something)

字源 FORM — what the parts do

忍to endure; to hold back (忍耐)rěn
不not (不要)bù
住to hold fast; (after a verb) to keep in check (記住)zhù
忍不住，忍耐的忍，不要的不，記住的住。

故事 STORY — a scene to remember it by

心（心）上壓著一把刀（刃），到底壓不住。
A blade (刃) presses on the heart (心), and it cannot be held down.
記憶法
關 · Related
忍耐rěnnàito bear it — the same 忍受不了shòubùliǎocan't take it — the same "can't … it" frame