wet the bed

• IPA^(key): /wɛt ðə ˈbɛd/

wet the bed (third-person singular simple present wets the bed, present participle wetting the bed, simple past and past participle wet the bed or wetted the bed)

1. (idiomatic) To urinate in one's bed (during sleep).
   • 1998 November, Bethany Campbell [pseudonym; Sally Lea McCluskey], Hear No Evil, New York, N.Y.: Bantam Books, →ISBN, page 238:

     Unsecure is what she was. She wetted the bed a lot, and always she was sucking on her thumb.

2. (euphemistic) To go bad, to fail. Often said of machines; a euphemism for shit the bed.

• to wet oneself (nearly synonymous, whereas the distinction is wetting one's clothing while awake versus wetting the bedclothes, usually while asleep)

• bedwetter
• bedwetting

• piss-the-bed (pissabed)