entries → 必須
TSUMUGU · TOCFL 2 (est.) · 詞
必須 word · TOCFL 2 (est.)
必須 ＝ 必 ＋ 須
ㄅㄧˋ ㄒㄩ · bìxū
adverb — must; have to; necessarily

字源 FORM — what the parts do

必certainly; must (必要的必)bì
須necessary; must (必須的須)xū
必須，必要的必，必須的須。
關 · Related
應該yīnggāishould — a softer obligation than 必須必要bìyàonecessary — the adjective form of the same idea