>A sentence or phrase that can be interpreted in more than one way.
>Double or doubtful meaning; ambiguity, esp. from uncertain grammatical construction.
It is derived from amphi- (“both”) and ballein (“to throw”), literally means “encompassing” or “hitting at both ends”; figuratively it means “ambiguous.”
Example
>When Mom talked to Judy, she said she might call her back the next day
(Who said who might call whom back? That’s not clear)
>They are flying planes’
(This means either that someone is flying planes or that something is flying planes)