POUND OUT

v. phr. 1. To play a piece of music very loudly on a percussion instrument. The boy was pounding out the tune "Mary had a little lamb" on the marimba. 2. To flatten something with a hammer. The bodyshop uses special hammers to pound out the indentations in the bodies of cars. 3. To produce a piece of writing on a typewriter in haste and without much care. She hurriedly pounded out a letter of recommendation for the foreign graduate student.