Bear raid
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A bear raid is a type of stock market strategy, where a trader (or group of traders) attempts to force down the price of a stock to cover a short position. The name is derived from the common use of 'bear' or bearish in the language of Market sentiment to reflect the idea that investors expect downward price movement.
A bear raid can can be done by spreading negative rumors about the target firm, which puts downward pressure on the share price. This may be a form of securities fraud. Alternatively, traders could take on large short positions themselves, with the large volume of selling ideally causing the price to fall, making the strategy self perpetuating.