1
general::
1. Also, throw or toss out. Dispose of, discard, as in This coat is too good to throw away, or Did you throw out the rest of the milk? or She tossed out all his old letters. [First half of 1500s] 2. Waste, fail to use, as in She's thrown away her inheritance on all kinds of foolish enterprises, or He's thrown away his chances for an engineering job. [Mid-1600s] 3. Also, throw out. Utter or perform in an offhand, seemingly careless way, as in He threw away the news that their summer cottage had been broken into, or She threw out some suggestions for changing the bylaws. [First half of 1900s]
American Heritage Idioms
2
general::
Phrase(s): throw something away
to toss something out; to dispose of something. • Should I throw this away? • Don’t throw away anything that might be useful.
McGrawhill's American Idioms And Phrasal Verbs