blunder
"a stupid or careless mistake" -- Google dictionary
benefit of the doubt
a favorable judgement given in the absence of full evidence. —request
humble pie
a figurative serving of humiliation usually in the form of a forced submission, apology, or retraction —often used in the phrase eat humble pie —merriam-webster.com
overreach
"to defeat (oneself) by overdoing matters, often by excessive eagerness or cunning" --dictionary.com
technique
a way of doing an activity that needs skill --dictionary.cambridge.org
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