عش1 عَشَّ, (TK,) inf. n. عَشٌّ, (K,) He (a bird) kept to his عُشّ [or nest in a tree]. (K, TK.) 2 عشّش, inf. n. تَعْشِيشٌ, He (a bird) made for himself a nest in a tree; (S, O, K;) as also ↓ اعتشّ, (A, K,) or اعتشّ عُشَّهُ, (O,) inf. n. اِعْتِشَاشٌ. (TA.) b2:  It is said in a trad., (A, K,) in the story of Umm-Zara, (O, TA,) لَا تَمْلَأُ بَيْتَنَا تَعْشِيشًا, meaning She will not be unfaithful with respect to our food, or wheat, by hiding somewhat in every corner, (A, O, K,) like birds that make their nests in sundry place, (O,) so that it becomes like the nest of the bird in a tree, (A, O,) or so that it becomes like the place where the birds make their nests in a tree. (K.) [See another reading in the first paragraph of art. غش.] b3:  You say also, of a person greatly erring, and obstinately persevering in evil, عشّش الشَّيْطَانُ فِى قَلْبِهِ (assumed tropical:)  [The devil hath made a nest in his heart]. (TA in art. فحص.) A2:  عشّش الخُبْزُ The bread became mouldy, or spoiled and overspread with greenness, (S, A, O, K,) and dried up. (S.) A3:  عشّش الخُبْزَ He left the bread until it became mouldy, or spoiled and overspread with greenness [and dried up]. (A.) 8 إِعْتَشَ3َ see the next preceding paragraph.عَشٌّ: see the paragraph here following.عُشٌّ The nest of a bird, formed of what it collects together, (S, A, Mgh, O, Msb, K,) of slender pieces of sticks, (S, A, O, K,) &c., (S, O,) or of fragments of sticks, (Mgh, Msb,) in which it lays its eggs, (Mgh,) in a tree, (S, A, Mgh, O, Msb, K,) in the branches thereof; (S, A, O, K;) as also ↓ عَشٌّ: (A, K:) but if in a mountain, (S, O, Msb,) or a building, (Msb,) or a wall or the like, (S, O,) it is called وَكْرٌ, and وَكْنٌ; and if in the ground, أُفْحُوصٌ, (S, O, Msb,) and أُدْحِىٌّ: (S, O:) or the nest of a raven or other bird, upon a tree, when it is dense, or compact, and large: (Lth, T:) pl. [of pauc.] أَعْشَاشٌ (S, Msb) and [of mult.]عِشَاشٌ and عِشَشَةٌ (S, Mgh, Msb) and عُشُوشٌ. (TA.) [See also عُشْعُشٌ.] It is said in a prov., quoted in a خُطْبَة of El-Hajjáj, (O, TA,) لَيْسَ هٰذَا بِعُشِّكِ فَادْرُجِى [(assumed tropical:)  This is not thy nest, or] thou hast no right in this; therefore go thy way: (A, O, K: *) addressed to him who alights in a place of abode not befitting him: (A, TA:) or to him who raises himself above his rank: and to him who applies himself to a thing not of his business to do: and to him who is at case in an improper time; wherefore he is thus ordered to be diligent and in motion. (TA.) And in another prov., (TA,) تَلَمَّسْ أَعْشَاشَكَ (assumed tropical:)  Seek thou, or seek thou repeatedly, after pretexts, and [causes for] false  accusation, in thy family (O, L, K, TA) and those belonging to thee: (TA:) [not in others: (see Freytag's Arab. Prov., i. 235:)] nearly like the former proverb. (TA.) [In the CK, تَلَمَّسَ is erroneously put for تَلَمَّسْ.]عُشَيْشَةٌ and عُشَيْشِيَةٌ: see art. عشو.عُشَيْشَانٌ and عُشَيْشِيَانٌ: see art. عشو.عُشْعُشٌ, (IAar, S,) or عَشْعَشٌ, as written by Sgh, (TA,) or both, (O, K,) A nest such as is called عُشّ, when heaped up, one part upon another. (IAar, S, O, K.) مَوْضِعُ كَذَا مُعَشَّشُ الطُّيُورِ [Such a place is the place where the birds make their nests in the branches of trees]. (S, O, K. *)