1. (n.) A loss of advantage, or deduction from profit, value, success, etc.; a discouragement or hindrance; objectionable feature.

2. (n.) Money paid back or remitted; especially, a certain amount of duties or customs, sometimes the whole, and sometimes only a part, remitted or paid back by the government, on the exportation of the commodities on which they were levied.

abatement agio allowance bank discount blemish block blockade bottleneck breakage bug cash discount catch chain discount charge-off concession cordon crack curtain cut damage deduction defect defection deficiency depreciation determent deterrent detriment difficulty disability disadvantage discount evil failing failure fault faute flaw foible frailty handicap hang-up harm hazard hindrance hitch hole hurdle hurt ill impairment impediment imperfection inadequacy inconvenience infirmity injury joker kickback kink liability little problem loss loss of ground mischief objection obstacle obstruction obstructive one small difficulty penalty penalty clause percentage prejudice premium price reduction price-cut problem rebate rebatement reduction refund rift rollback rub salvage setoff shortcoming snag something missing step backward stumbling block stumbling stone taint tare time discount trade discount tret trouble underselling vulnerable place weak link weak point weakness write-off