Dictionary.net

• To strike with something hard or heavy; to move by striking; to drive (a thing) against something; as, to knock a ball with a bat; to knock the head against a post; to knock a lamp off the table.

2010 - New Age Dictionary Database
By Oddity Software

• To strike with something hard or heavy; to move by striking; to drive (a thing) against something; as, to knock a ball with a bat; to knock the head against a post; to knock a lamp off the table.

1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.