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a horseback opinion
An opinion that is not well thought out (with the implication that one has not even taken the time to get off one's horse to give the issue more careful consideration). Now that I've learned more about the cheating scandal and had time to think about it all, I wish I could take back my initial horseback opinions.
not know if (one) is afoot or on horseback
To be so totally and utterly confused as to be unaware of one's actions. I've had such a long day that I don't know if I'm afoot or on horseback—I think I need to lie down! I finally got Billy a math tutor because his test grades clearly showed that he didn't know if he was afoot or on horseback in that class.
a beggar on horseback
One who has become unscrupulous or irresponsible due to the sudden acquisition of wealth. The phrase alludes to several related proverbs, such as "give a beggar a horse and he'll ride it to death" and "set a beggar on horseback and he'll ride to the devil," which suggest that an unexpected windfall is often misused or squandered. I'm not surprised to hear that he's broke again—he always seemed like a beggar on horseback.
on the back of a horse. Anne rode on horseback across the field. Because they loved horses, the couple decided to marry on horseback.
Set a beggar on horseback, and he'll ride to the devil.
Prov. If a poor person becomes wealthy, he or she will quickly become corrupt. Jill: Since Phil inherited all that money, all he does is go to parties and take drugs. Jane: Yep. Set a beggar on horseback, and he'll ride to the devil.
beggar on horsebacka formerly poor person made arrogant or corrupt through achieving wealth and luxury.
Compare with the mid 17th-century proverb set a beggar on horseback and he'll ride to the devil , meaning that a person not used to power will use it unwisely.