If you want to literally crush your opponents in Old School RuneScape, you will probably use mauls, maces and hammers. If you want to know the best crush weapons in OSRS, I have listed them below.
Alinity almost banned again #shorts
These are the best one- and two-handed crush weapons to go for at the time of writing. Be prepared to do a lot of grinding, or have a lot of gold, as these weapons (or the components needed to craft them) are generally rare drops.
The Hill Giant Club has to be mentioned here, because while weak compared to everything on this list, it is the best crush weapon for F2P players. You need 40 Attack to use it and it provides +65 Crush (Speed 3). To find one, you will need to grind Hill Giants to get a Giant Key, then defeat the Hill Titan Obor in his lair (it's a rare drop).
This two-handed maul requires 50 Attack and Strength to use and grants a solid +81 Crush (Speed 4). While it may seem slow, it has a special Quick Smash attack that deals an instant hit, so if you time it right it’s possible to land three hits in quick succession. This is great in PVP for quickly taking down opponents, but otherwise it’s not a favored weapon outside of its usefulness in the Nightmare Zone.
