A dusack (also dusägge and variants, from Czech tesák "cleaver; hunting sword", lit. "fang") is a single-edged sword of the cutlass or sabre type, in use as a side arm in Germany and the Habsburg Monarchy during the 16th to 17th centuries, as well as a practice weapon based on this weapon used in early modern German fencing.
The Czech term entered German usage in the Hussite Wars, after the sidearm used by the Hussites. In the late 16th century, Dusägge could refer to a type of weapon combining a sabre blade with the hilt of a sidesword (the German Degen), also known as Säbel auf Teutsch gefasst ("sabre fitted in the German manner"). The Dusägge in this sense was used as a military sidearm; e.g. in 1579, Styria records delivery of some 700 Dusäggen by local bladesmiths, besides payment of 40 Dusäggen delivered from Passau, as part of the preparation for the war against the Turks under Archduke Charles II.
Joachim Meyer in 1570 depicts the Dusäck as the practice weapon with broad, curving blade and a simple oval grip. The dussack represented a short, single-edged weapon in a training environment. As usage of the dussack became more widespread, various schools turned use of the dussack into a sport as opposed to training for a real weapon.
Practice dussacks had a short, thick, single-edged blade measuring between 25 and 38 inches (65 and 95 cm) long. A dussack was usually made of wood. Additionally there is a single reference to dussacks also being made from leather, and there are a small number of simple metal dussacken known to survive. The dussack was gently curved and brought to a point at the tip. The dussack often lacked a hilt. Instead, the handgrip was merely a hole cut inside of the blade; without a pommel or upper guard, it looked something like a large hole for gripping scissors.
Egerton Castle claimed that dussacks were used by the French Navy up through the 19th century. 
No wooden (or leather) practice dussacks are known to have survived; unsurprising given the perishable nature of the dussack, and only woodcuts and training manuals from the period document their existence.
- in Early Modern High German variously spelled dusack, dusäck, dussack, dysack, tesak, tuseckn, thuseckn, disackn, dusägge, dusegge, dusegg
- Charles John Ffoulkes, The Armourer and His Craft from the XIth to the XVIth Century, Courier Corporation, 1912, p. 159.
- Amberger, J. Christoph (2000). The secret history of the sword: adventures in ancient martial arts. Multi-Media Book. pp. 185–186. ISBN 978-1-892515-04-9.
- "Säbel, 'Dusägge', Deutsch Ende 16. Jahrhundert", Waffensammlung Beck, Inv-Nr.:Be 10.
- Claude Blair, "The Early Basket Hilt in Britain" in: Scottish Weapons and Fortifications (ed. David H. Caldwell, 1981)
- Amberger (2000), p. 222.
- Castle (1885), p.247.