Lewis Short
mergae (noun F) : root marg-, to clear away; cf.: ἀμέργω, ἀμέλγω, mulgo, amurca
* A two-pronged pitchfork, with which corn, when cut, was made into heaps: mergae furculae, quibus acervi frugum fiunt, dictae a volucribus mergis, quia, ut illi se in aquam mergunt, dum pisces persequuntur, sic messores eas in fruges demergunt, ut elevare possint manipulos, Paul. ex Fest, p. 124 Müll.: mergas datus, ut hortum fodiat,Plaut. Poen. 5, 2, 58: multi mergis, alii pectinibus spicam ipsam legunt,Col. 2, 21, 3.—Comically: si attigeris ostium, jam tibi hercle in ore fiet messio mergis pugneis,i. e. a rich crop of fisticuffs,Plaut. Rud. 3, 4, 58.
Charlton T. Lewis, Charles Short, A Latin Dictionary