How to explain the word "zi" in this idiom?

The original meaning of this word is to have children, but this word also means to marry in ancient Chinese and is also used as a solution in this idiom.

Another publishing house, Chinese Dictionary:

Without a word, promise to marry a woman.

[Girl]

keep

arrive

be

Engagement]

Even the big girls who wait for the word have to draw lots. -Mao Dun "Shake"

Another example: the word person (female marriage)

word

eye

Stay in the boudoir and wait for your engagement-not yet.

frequency of utilization

frequently-used

hair

sound

put on

ɡuī

zhōnɡ

explain

fair

Stay in the boudoir and wait to get married. It used to mean that women were waiting to be hired as adults.

appear

place

"Book of Rites Qu Lishang": "A woman who wants to marry is full of words."

show

example

Cultivate a daughter who is as beautiful as a pearl. Her talent and looks are not particularly good, and she still has a pair of small feet. Now 17 years old, she wants to be a lady. (Huang Qing Xiaopei's "Twenty Years of Fan Huameng" for the second time)

hero

writing

be

no

however

be engaged

arrive

a

man

use

law

Partial form; As predicate and attribute; Include praise

return