Want to know the meaning of these sentences

[Imsriram]

What are the meanings of these?
"Downright testy"
"They have got your back"
"I must have him on speed dial"
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I like this very much :-)

[Mordant]

Hi.

The first is no sentence. It means "absolutely irritable or combative."

The second means they will support or defend you, particularly if something bad happens.

The third means someone has used a system that automatically dials a programmed phone number with the push of a single button.

[Imsriram]

Thanks
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I like this very much :-)