A scythe can be used to make trip attacks. If you are tripped during your own trip attempt, you can drop the scythe to avoid being tripped.
A scythe constructed for fighting (as opposed to a standard harvesting scythe) has had its blade transformed so that it extends upright from the staff, and is used much like a halberd.
Weapon Feature(s): trip
|Two-Handed Melee Weapons (Martial)|
|Cost||Damage (S)||Damage (M)||Critical||Range Increment||Weight||Type||Special|
|Scythe||18 gp||1d6||2d4||×4||||10 lb.||Piercing
Source: Core Rulebook