Etymology 1

Noun

1. A shield-bearer or armor-bearer who attended a knight.
2. A title of dignity next in degree below knight, and above gentleman. See esquire.
3. A male attendant on a great personage.
4. A devoted attendant or follower of a lady; a beau.
5. A title of office and courtesy. See under esquire.

Verb

1. To attend as a squire
2. To attend as a beau, or gallant, for aid and protection

Etymology 2

Noun

1. A ruler; a carpenter's square; a measure.
   • 1598, Edmund Spenser, The Faerie Queene

     But temperaunce, said he, with golden squire, / Betwixt them both can measure out a meane.

   • 1598, William Shakespeare, Love's Labour's Lost, V, 2, 474.

     do not you know my lady's foot by the squire.

   • 1620, Robert Burton, The Anatomy of Melancholy

     "as for a workman not to know his axe, saw, squire, or any other toole,"

   • 1628, William Shakespeare, The Winter's Tale, IV, 4, 348.

     twelve foot and a half by the squire.