verb intrans
to be vexed or worried
to chafe
to eat into something; to corrode or fray
said of running water: to become agitated
to torment (somebody) with anxiety or worry
to eat or gnaw into (something); to corrode
to rub or chafe (something)
to make (e.g. a channel) by wearing away the earth or other surface material
[Old English fretan to devour]