صغو doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 3 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• صَغَا Form 1

  1 صَغَا ذ , aor. يَصْغُو; (S, Msb, K;) and [صَغَى, aor.] يَصْغِى, (S, TA, and so in some copies of the K,) or يَصْغَى; (Msb, and so in some copies of the K, and in the M, but it is said in the TA that it is correctly يَص…

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• صَغْوٌ

  صَغْوٌ ذ : see the next preceding paragraph. [هٰذَا ٱبْنُ صَغْوِكَ, or , is a phrase similar to هذا ابن إِنْسِكَ, meaning This is thy chosen, or special, friend or companion: but perhaps postclassical.]…

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• صِغْوٌ

  صِغْوٌ ذ : see صَغًا and صَغْوٌ. -A2- Also The interior of a ladle: -b2- and the side of a well: -b3- and the part that is folded, or turned over, of the sides of a دَلْو [or leathern bucket]: K, TA:) so in the M: and it…

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