Definitions
1.verbSway unsteadily, reel, or totter.
2.verbDoubt, waver, be shocked.
3.verbHave multiple groups doing the same thing in a uniform fashion, but starting at different, evenly-spaced, times or places (attested from 1856).
4.adjectiveAstonished, taken aback.
5.adjectiveArranged in a way that is not uniform."The U.S. Senate holds staggered elections, with only one third of the seats being filled every two years."