1. (verb) enter uninvited

• intrude

2. (verb) erupt or intensify suddenly

• break open
• burst out
• erupt
• flare
• flare up

3. (verb) increase rapidly and in an uncontrolled manner

• explode

1. (verb) enter uninvited

• barge in
• crash
• gate-crash
• bother
• break in
• move in on

1. (verb) enter uninvited

• come in
• enter
• get in
• get into
• go in
• go into
• move into

2. (verb) erupt or intensify suddenly

• deepen
• intensify

3. (verb) increase rapidly and in an uncontrolled manner

• increase

1. (verb) enter uninvited

• encroachment
• intrusion
• trespass
• usurpation
• violation
• interloper
• intruder
• trespasser
• intrusive
• irruption

2. (verb) erupt or intensify suddenly

• burst
• flare-up
• outburst
• eruption
• eruption
• irruption
• irruption
• outbreak
• outbreak

3. (verb) increase rapidly and in an uncontrolled manner

• explosion

1. (verb) enter uninvited

• encroach upon
• intrude on
• invade
• obtrude upon