děi / de /
verb HSK 4 #49

Meanings

  1. 1 must; have to
  2. 2 need to; ought to
  3. 3 (colloquial spoken) will need / will take (time, money)

Examples

Wǒděi zǒu le.
I have to go now.
Nǐ děi xiǎoxīn yīdiǎn.
You have to be a bit more careful.
Míngtiān wǒmen děi zhǔnshí dào.
Tomorrow we have to arrive on time.

Tips

register
děi is the everyday spoken word for 'must / have to' in northern Mandarin and standard speech, sitting between a subject and a verb: 睡觉 (I have to sleep). Compare with 必须 (more formal, written) and (broader 'will/want to'). In writing, 必须 is usually preferred.
mistakes
Beginners often misread as wǒ dé zǒu (verb 'to obtain') — but here is the spoken modal 'must'. Rule of thumb: subject + + verb = obligation (děi). Verb + + complement = manner/degree (toneless de). Standalone verb = to obtain (dé).

Components

radical
chì
step; left-side stride radical
Left is the step radical — a small footstep, the left half of 'to walk'. Anchors in the motion family: , , , , . The original oracle-bone showed a hand grasping a cowrie while walking — going out and getting — exactly the picture the three components recreate.
semantic
dàn
dawn; sun over horizon (graphic residue)
Middle -over- is now read as dawn, but historically it's a stylised residue of cowrie / money — the thing being obtained in the original oracle-bone scene. Modern shape is opaque, but historically grounds the meaning 'gain, acquire'. Pure semantic role; supplies no sound. The substitution of for happened during the bronze-script period.
semantic
cùn
thumb measure; hand
Bottom-right — a hand with a marker at the wrist showing the cùn 'inch' measure-point. In it functions pictographically as a hand reaching out to take. Together: going + cowrie + hand = walk out, lay your hand on it, it — exactly the action of obtaining.

Stroke Order

děi