Recognition caution
weasel out of something
Meaning
Avoid doing something you promised or are expected to do, often by using an excuse.
Tone & use
Informal and critical; it suggests evasiveness or dishonesty, not simply being unable to do a task.
Example
“He did not try to weasel out of the agreement; he explained the delay and proposed a new date.”
Implies bad faith; do not use it as a neutral synonym for canceling or rescheduling.