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plural coistrils
(obsolete) An inferior groom or lad employed by an esquire to carry the knight's arms and other necessaries; a coistrel.
(obsolete) A mean, paltry fellow; a coward. quotations
And he shall 'by his merriment as dear / As ever coistril bought so little sport: / Ne'er let this sword assist me when I need, / But rust and canker after I have sworn.
c. 1592, William Shakespeare, Anonymous, Arden of Faversham, act 3, scene 2
He's a coward and a coistril that will not / drink to my niece till his brains turn o'the toe like a / parish top.
c. 1601–1602, William Shakespeare, Twelfth Night, act 1, scene 3