A person who criticizes, second-guesses, or offers advice about decisions (originally about sporting plays) from the comfort of hindsight and without direct involvement or practical experience.
Examples:
EN: It's easy to armchair quarterback.
ES: Es fácil opinar desde tu sofá.
EN: But, yes, we're playing "armchair quarterback" here.
HI: खैर, हां, वे यहां "लोकतांत्रिक" प्रदर्शन कर रहे हैं।
EN: You are a classic armchair quarterback.
ID: Kau memang orang yang tak memikirkan orang lain.
EN: I'm no going to try and armchair quarterback Dr. (Saqib) Shahab at this stage in the game.
TE: టీమ్లో అతనికి పోటీగా ఉన్న ఏ స్పిన్నర్ (కుల్దీప్, చాహల్) ఈ తరహాలో బ్యాటింగ్లో చేయలేరు.
EN: I'm not interested in being his armchair quarterback, and I certainly don't want to be his shrink, okay?
ES: No me interesa dar mis opiniones ni quiero ser su psiquiatra, ¿sí?
EN: - I apologize, Mrs. Beckett. But you're sitting in that chair playing armchair quarterback saying that my client could've prevented this tragedy.
ES: - Discúlpeme, Sra. Beckett pero usted está ahí sentada hablando como si fuera experta diciendo que mi clienta pudo evitar esta tragedia.