simple past tense and past participle of rot through

Bad leaders harm an organization.

Of perishable items, overridden with bacteria and other infectious agents. / In a state of decay. / Cruel, mean or immoral. / Bad or terrible.

To an extreme degree.

Mechanical routine; a fixed, habitual, repetitive, or mechanical course of procedure.

By repetition or practice.

(obsolete) To go out by rotation or succession; to rotate. / (transitive) To learn or repeat by rote.

(rare) The roar of the surf; the sound of waves breaking on the shore.

(music) A kind of guitar, the notes of which were produced by a small wheel or wheel-like arrangement; an instrument similar to the hurdy-gurdy. / Synonym of crowd.

A rotating part of a mechanical device; for example, in an electric motor, generator, alternator, or pump. / (aviation) The wing of a helicopter or other rotary-wing aircraft.