What is the meaning of Clappen?

to clap, to make a clapping sound

to knock

to chatter

to tell

To make a loud noise, especially by talking or striking.

To pound or slap; to make a beating or stroke.

To clap; to strike two things against each other.

To slam or strike; to make a forcible striking motion.

To make a specific utterance loudly.

To beat or throb; to inflate then deflate.

Source: wiktionary.org