abrasion, attrition (wearing by friction)

to wear, be worn away

blind spot (place where the optic nerve attaches to the retina) / something overlooked, a point not noticed

once again, once more

felt

dead / one who is preoccupied with money, power, etc.

black hairy tongue

a mouse, a rat

crowding with a large numbers of people / same as above

knead (to work and press into a mass) / elaborate, work out (an idea etc.) / polish (refine; improve imperfections from) / soften, gloss (silk)