discourtesy; impoliteness; excuse me; goodbye; to leave; to be rude
accident (caused by negligence); error; blunder; fault; defect
loss (of assets, profit, etc.)
forgetting; lapse of memory
unemployment; losing one's job; becoming unemployed
verbal gaffe; verbal slip; slip of the tongue; using improper words
disappointment; despair; despondency; broken heart; adversity
loss of eyesight; loss of vision; going blind; blindness
advantages and disadvantages; plus and minuses
forgetting the words; inability to pronounce a word correctly
error made by the enemy or opposing team
apologies for tweeting to you without either of us following the other