To drive or be driven against something; to strike against something; to clash; as, one heavy body knocks against another.(verb)
source: webster1913
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.(verb)
source: webster1913
To practice evil speaking or fault-finding; to criticize habitually or captiously.(verb)
source: webster1913
To impress strongly or forcibly; to astonish; to move to admiration or applause.(verb)