to intentionally hinder or prevent an action, plan, or progress from succeeding

persistent and unyielding; refusing to give up or be defeated despite setbacks

to scratch one's head, typically as a gesture indicating puzzlement, confusion, or frustration

to keep on fighting in spite of all setbacks; to be undaunted by repeated failure

to scratch an itch or a surface with one's fingernails

to tweak one's ears and scratch one's cheeks as an expression of anxiety, delight, or frustration

to tickle

the deformation of a structural element or geological layer under load

iron hook at the end of a long pole

backscratcher (made from bamboo etc)

to bend or flex physically

the torsion of a space curve

to be defeated, routed, or crushed in battle or conflict

split or crack in a material caused by repeated folding or bending

variant of [[干扰|干擾|gan1 rao3]], to interfere