Early Bird

What does the idiom “early bird” mean?

Definition:

early bird [noun or adjective]:
Someone who does something prior to the usual time, or someone who gets up early.

For example:

“If you think prices at restaurants are too high, many of them offer early bird discounts for people who eat before 5 p.m.”

“The early bird catches the worm” (proverb, meaning people who are very prompt reap rewards).

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