American Heritage Dictionary
(2)
Century Dictionary
(5)
GNU Webster's 1913
(2)
WordNet
(2)
Elsewhere on the web
Once banks are convinced that their mentors in the corridors of power could compel the CBN to look the other way while they engage in forex round-tripping, the naira would trade for N180 to the dollar before the second quarter of this year.— AllAfrica News: Latest
Excuse my ego-tripping, but this is the kind of catchphrase that will stick right into people skulls once it starts spreading.— AMERICAblog News| A great nation deserves the truth
Officials called tripping, and Roy hit two free throws with 1.7 seconds left to put Portland up 107-105.— IndyStar.com Top Stories
Day-tripping is the term of choice among business owners and merchants.— The Natchez Democrat

Century Dictionary (2)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word a few times a month.