i Register
In some senses, heaving is marked as informal. Watch for register when choosing this word.
adj
Crowded with people.
2006, Tim Downie, "Ride Report: Bealach-na-Ba", uk.rec.cycling http://groups.google.com/group/uk.rec.cycling/browse_thread/thread/af08b5a62b82262c/192dcd8f8dca7b8e?lnk=st&q=%22was+heaving%22&rnum=7#192dcd8f8dca7b8e Kinlochewe was heaving with cyclists and their vehicles on Saturday morning but somehow, the organisers had found space for everyone and the main roads were kept clear.
2006, "Krusty", "Krusty's Holiday", uk.rec.motorcycles, http://groups.google.com/group/uk.rec.motorcycles/browse_thread/thread/f3c43a458f94a29b/bdff0eb3decbb853?lnk=st&q=%22was+heaving%22&rnum=99# The pool was heaving with screaming kids. By contrast the beach was virtually deserted, apart from the one day a cruise ship docked & a group of about 10 people appeared.
noun
An occasion on which something heaves or is heaved.
No swellings tell that winds may be Upon some far-off happier sea-- No heavings hint that winds have been On seas less hideously serene."
His throne rocked with subterraneous heavings.