The Collaborative International Dictionary of English v.0.48:

Peach \Peach\ (p[=e]ch), v. t. [See Appeach, Impeach.]
   To accuse of crime; to inform against. [Obs.] --Foxe.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Peach \Peach\, v. i.
   To turn informer; to betray one's accomplice. [Obs. or
   Colloq.]
   [1913 Webster]

         If I be ta'en, I'll peach for this.      --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Peach \Peach\ (p[=e]ch), n. [OE. peche, peshe, OF. pesche, F.
   p[^e]che, fr. LL. persia, L. Persicum (sc. malum) a Persian
   apple, a peach. Cf. Persian, and Parsee.]
   1. (Bot.) A well-known high-flavored juicy fruit, containing
      one or two seeds in a hard almond-like endocarp or stone.
      In the wild stock the fruit is hard and inedible.
      [1913 Webster]

   2. The tree (Prunus Persica syn. Amygdalus Persica) which
      bears the peach fruit.
      [1913 Webster]

   3. The pale red color of the peach blossom, or the light
      pinkish yellow of the peach fruit.
      [PJC]

   Guinea peach, or Sierra Leone peach, the large edible
      berry of the Sarcocephalus esculentus, a rubiaceous
      climbing shrub of west tropical Africa.

   Palm peach, the fruit of a Venezuelan palm tree (Bactris
      speciosa).

   Peach color, the pale red color of the peach blossom.

   Peach-tree borer (Zool.), the larva of a clearwing moth
      (Aegeria exitiosa, or Sannina, exitiosa) of the family
      Aegeriidae, which is very destructive to peach trees by
      boring in the wood, usually near the ground; also, the
      moth itself. See Illust. under Borer.
      [1913 Webster]

WordNet (r) 3.0 (2006):

peach
    n 1: cultivated in temperate regions [syn: peach, peach
         tree, Prunus persica]
    2: a very attractive or seductive looking woman [syn: smasher,
       stunner, knockout, beauty, ravisher, sweetheart,
       peach, lulu, looker, mantrap, dish]
    3: downy juicy fruit with sweet yellowish or whitish flesh
    4: a shade of pink tinged with yellow [syn: yellowish pink,
       apricot, peach, salmon pink]
    v 1: divulge confidential information or secrets; "Be careful--
         his secretary talks" [syn: spill the beans, let the cat
         out of the bag, talk, tattle, blab, peach,
         babble, sing, babble out, blab out] [ant: keep
         one's mouth shut, keep quiet, shut one's mouth]