Meaning of 'by any chance, by all mean, come undone'

[Helmis]

Could you please tell me what "by all means, by any chance, come undone" mean?

I read these words in many songs and I just understand their meaning a little bit but not so exact. I want to know the precise meaning.

Thanx a lot.

[Mister Micawber]

,
There is some range of meanings, but basically:

by all means -- certainly; indeed
by any chance -- perhaps; possibly
come undone -- fall apart; collapse; fail; become unbuttoned
.
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Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber

[Attila]

For me 'by any chance' means 'accidentally', too, like in:

if you, by any chance see her. This is the same as
if you should happen to see her.

Is it correct?

Can 'by all means' replaced by 'anyhow' ? like in:

Anyhow, I have a low opinion of him.
By all means, I have a low opinion of him.

[Alan]

Hi Attila,

By all means has the notion of certainly/of course when you agree with or support totally what someone has suggested/asked as in:

A Is it all right if I borrow your car again tonight?

B By all means (of course/certainly/indeed), borrow it whenever you like.

Alan
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English as a Second Language
You can read my ESL story Adverbs