What does "collapsing" mean?

present participle and gerund of collapse

What is a synonym for "collapsing"?

Common synonyms include: breakdown, breaking, caving in, collapse, crack, crash.

verb

verb ·3 syllables ·Uncommon ·College level

Verb

1
present participle and gerund of collapse form-of, gerund, participle, present

"This building is on the verge of collapsing."