1) Look bad 2) Underachieve 1) Perform 2) Underachieve 
In general, this means to do worse than some particular benchmark. Mutual Fund XYZ is said to underperform the S&P500 if its return falls short of the S&P500 return. However, this language does not take risk into account. That is, one might have a lower return than the benchmark in a particular year because of lower risk exposure. Underperf...
When a security is expected to appreciate at a slower rate than the overall market. 
A margin account that no longer meets minimum maintenance requirements, requiring a margin call on t
[v] - perform too rarely
to perform less well than (another of its kind, a general average, etc.) or less well than expected: Surprisingly, the stock has underperformed the market indexes all year. Several of our best players consistently underperform.