American Heritage Dictionary
(2)
Century Dictionary
(2)
GNU Webster's 1913
(2)
WordNet
(3)
Elsewhere on the web
The two streams will collide, at four points, with the energy of two aircraft carriers sailing into each other at 11 knots, inside detectors so vast that one is housed in a cavern that could enclose the nave of Westminster Abbey.— CRUSADER RABBIT
A current leading theory says that when galaxies collide, their black holes end up revolving around each other.— EurekAlert! - Breaking News
Two of my favorite shows are about to collide -- and it sounds like it's going to have us ROFWL!— EW.com: Today's Latest Headlines
When two planes almost collide, they call it a near miss.— MND: Your Daily Dose of Counter-Theory

American Heritage Dictionary (1)
Century Dictionary (1)
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 about twice a month.
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