to rub / to scrub, to scour / to scrape, to scratch

rub / grate / scrape / friction / chafe / brush / scour / scrub

rub, scrub / strike a match / lose at gambling

to graze, to touch lightly / to take a cut (of profits, etc.), to exploit, to extort

to smear, to rub on to (something), to spread over (something) / to lay blame on (someone), to attribute responsibility to (someone)

(phonetics) sibilant

(phonetics) an affricate