What does "did" mean?

Initialism of direct inward dialing.

What is a synonym for "did"?

Common synonyms include: accomplish, auxiliary verb, complete, execute, helping verb, perform.

/dɪd/ noun, verb

noun, verb ·Uncommon ·Advanced level

Noun

1
Initialism of direct inward dialing. abbreviation, alt-of, countable, initialism, uncountable
2
Initialism of dissociative identity disorder. abbreviation, alt-of, countable, initialism, uncountable
3
Initialism of damsel in distress. abbreviation, alt-of, countable, initialism, uncountable
4
Initialism of digital input device. abbreviation, alt-of, countable, initialism, uncountable
5
Initialism of densely inhabited districts. Japan, abbreviation, alt-of, countable, initialism, uncountable

Verb

1
simple past of do form-of, past
"Jeez, did I make a mistake!"
2
past participle of do; done Southern-US, especially, form-of, nonstandard, participle, past
"[…]But I don't care, I mean I don't even care. She shouldn't have did that.""

"How did you come up with this crazy idea?"