irruptions
Violent bursting inward
Irruptions are sudden, forceful entries or invasions.
The word suggests breaking in violently or abruptly: irruptions of barbarian tribes into Roman territory.
In ecology, an irruption is a rapid population increase, especially when animals suddenly expand into new areas: Snowy owl irruptions bring Arctic birds south in winter.
The word emphasizes inward movement—breaking into rather than breaking out.
Hostile territorial penetration
- intrusionUnauthorized entry into space
- raidSudden armed incursion
- encroachmentGradual intrusion on territory
- inroadGradual hostile encroachment
assault · foray · invasion · onslaught · infiltration · ingress · breach · penetration
Break apart suddenly
- outburstSudden emotional release
- surgeSudden powerful increase
- flare-upSudden recurrence of symptoms
- upsurgeRapid marked increase
spike · onset · outbreak · explosion · convulsion · paroxysm · upheaval · commotion
incursion
Hostile territorial penetration
- intrusionUnauthorized entry into space
- raidSudden armed incursion
- encroachmentGradual intrusion on territory
inroad · assault · foray · invasion · onslaught · infiltration · ingress · breach · penetration · trespass
burst
Break apart suddenly
upsurge · spike · onset · outbreak · explosion · convulsion · paroxysm · upheaval · commotion · flash
migration
Movement to new territory
proliferation · explosion · surge · colonization · spread · dispersal · habitat · territory · ecosystem · invasive species
explosion
Violent burst of energy
- blastSudden forceful burst
- lavaErupted liquid stone
- pyroclasticHot eruption debris
magma · caldera · ash · crater · vent · geyser · fumarole · seismic · tremor · plume
irruptionsretreats
Backs off or sanctuaries
withdrawals · departures · evacuations · exoduses · emigrations
irruptionsdepopulations
Drastic reductions in inhabitants
disappearances · abandonments · desertions · vacations · clearances