The opposite of a bear trap is a bull trap.
It is the moment when a lot of breakout traders are piling up long positions betting that the price will continue its extent.
Unfortunately, their expectations are not met. Alas- quite the contrary!
In fact, price reverses action and takes a lot of those traders’ stops out.
On the other side, there are the supply and demand traders sitting on those same levels and
counter-meeting the long orders with short orders.
This war-of-tug battle is combined a lot of limit orders being hit, which in its turn accelerates the selling pressure and leads to a sharp move down.