Agitation of the surface of a fluid by fermentation or some other cause; a rippling on the surface of water.

Agitation of the mind marked by complaint and impatience; disturbance of temper; irritation.

Herpes; tetter (“any of various pustular skin conditions”).

(mining, in the plural) The worn sides of riverbanks, where ores or stones containing them accumulate after being washed down from higher ground, which thus indicate to miners the locality of veins of ore.

(heraldry) A saltire interlaced with a mascle.

(music) One of the pieces of metal, plastic or wood across the neck of a guitar or other string instrument that marks where a finger should be positioned to depress a string as it is played.

A channel, a strait; a fretum.

(rare) A channel or passage created by the sea.

(Northumbria) A fog or mist at sea, or coming inland from the sea.

(transitive) To chafe or irritate; to worry.

(transitive) To make rough, to agitate or disturb; to cause to ripple.

(transitive) In the form fret out: to squander, to waste.

(transitive, intransitive) To gnaw; to consume, to eat away.

(transitive, intransitive) To be chafed or irritated; to be angry or vexed; to utter peevish expressions through irritation or worry.

(intransitive) To be worn away; to chafe; to fray.

(intransitive) To be anxious, to worry.

(intransitive) To be agitated; to rankle; to be in violent commotion.

(intransitive, brewing, oenology) To have secondary fermentation (fermentation occurring after the conversion of sugar to alcohol in beers and wine) take place.

(transitive) To decorate or ornament, especially with an interlaced or interwoven pattern, or with carving or relief (raised) work.

(transitive) To form a pattern on; to variegate.

(transitive) To cut through with a fretsaw, to create fretwork.

To bind, to tie, originally with a loop or ring.

(transitive, music) To fit frets on to a musical instrument and to press down the string behind a fret.