Mit jelent az az angolban hogy "come undone"?

Ez elég jól összefoglalja:

In the literal sense, this refers to something becoming untied, unwrapped, unfastened, etc. For example:

Be careful with that gift. If it comes undone, they'll be able to see what is inside.

In the figurative sense, it means that something has either not gone as planned, or has failed in some way. E.g. a plan can come undone meaning it hasn't worked as expected. A person can come undone meaning that they have lost their composure or self-control.

Andy came undone when Ann left him for Steve.