From Teflpedia

Weep is an English verb meaning "to cry".[1]

Weep is a lexical verb.

Weep is an irregular lexical verb; it has the third person form "weeps", the -ing form "weeping", but an irregular preterite and past participle "wept". The latter two may be over-regularlised to "weeped". Its pattern is similar to keep, sleep, sweep, and leap.

In its sense "to drain" however it is regular.

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