Definitions

1. noun

A person who knocks at doors, especially as a means of selling or soliciting

“The door-to-door knocker was persistent in trying to sell us a new vacuum cleaner.”

2. noun

A person who attacks or criticizes someone repeatedly or aggressively

“The politician was accused of being a knocker for constantly criticizing his opponent on social media.”

3. verb

To hit or knock something against something else

“The wind knocker the loose boards against the wall.”

4. verb

To criticize or attack someone repeatedly or aggressively

“The comedian is known for knocker his opponents in their performances.”

5. verb

To remove the bark of trees, especially with an axe

“The lumberjack was skilled in knocker the bark off the trees for use in making furniture.”