Solecism
Else clues• Apology preceder
• Big faux pas
• Blooper
• Blunder
• Blunder among company
• Boner
• Campaign-trail blooper
• Embarrasing mistake
• Faux pas
• Foot-in-mouth incident
• Howler
• Lack of tact, perhaps
• Minor mistake
• Misstep
• Mistake on the campaign trail
• Party blooper
• Putting one's foot in one's mouth, e.g.
• Social blunder
• A socially awkward or tactless act