What does 'stand by' mean?

[Luby]

Business Idiom in English, Intermediate level

ESL/EFL Test #72 "How to encourage", question 4

I'll ......... by you no matter what happens.

(a) stand
(b) keep
(c) lean
(d) support

Business Idiom in English, Intermediate level

ESL/EFL Test #72 "How to encourage", answer 4

I'll stand by you no matter what happens.

Correct answer: (a) stand

Your answer was: correct
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What does 'stand by' mean?

[The French]

Hi,

I am not a teacher, but I give a synonym the word 'support'. I hope it's help you.

Have a nice day.
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Do not hesitate to correct me.

[Vietanhpham_Winter]

In this situation, you can imagine that someone's standing next to you. By has a meaning proximately like next to.
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Nothing's impossible! Never say never! They're what I've been following. Hope you to follow them too!

[Super7SAM]

Hello sir,
how are you today.
I'm S.chandra from India.
I'm quite new to forum. I got my second lesson today and trying to improve my english efficiency.
thanks a lot for your help.
with warm regards.

[Kitosdad]

It actually means, someone who will be your friend and ally in times of trouble. They will never desert you and will always protect you.
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Keep it simple ... Keep it interesting.