扑棱

(onom.) fluttering or flapping of wings

to do sth repeatedly

to throw oneself at / to pounce on / to devote one's energies / to flap / to flutter / to dab / to pat / to bend over

square beam / variant of 稜|棱[leng2]

corner / edge / arris (sharp ridge formed by two surfaces meeting at an edge) / protrusion