Buying the dip and catching the falling knife are essentially the same action, but linguistic metaphors can influence the differences in behavior and thought. Be cautious when using these terms—this is one way linguistics can aid investment. The clarity of language is tied to the quality of investing; misuse can lead to confusion. This might also be one of the reasons I dislike the rhetoric of secondary market traders—their vocabulary is like heavily polluted water, and staying in it too long can make you sick.