叩く， 敲く， たたく
1. to strike, to hit, to beat, to knock, to pound, to bang, to slap, to spank, to tap, to pat, to clap (one's hands), to play (the drums)
2. to attack, to bash, to criticize, to censure, to flame (on the Internet)
3. to sound out (someone's views)
4....
敲，打