He acts like he is in his second childhood lately.
second childhood
idiomThe period or state of cognitive decline of an elderly person, characterized by childlike judgment and behavior.
The family worried when their grandfather started behaving erratically, wondering if he had entered his second childhood.
As the aging patriarch began to exhibit the whimsical yet confused temperament of a second childhood, his children struggled to balance his newfound joy with the reality of his declining health.
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have second thoughts
To change one's opinion, or be uneasy about a previous decision.
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just a second
A short period of time, typically anywhere from a few seconds to several minutes or more.
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play second fiddle
To play a subsidiary or subordinate role to someone or something else.
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second banana
A comedian who plays a secondary or supporting role, especially as straight man and traditionally in vaudeville or burlesque theatre.
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second fiddle
A sidekick or subordinate, or the role of such a person.
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second gear
Mediocre, sluggish performance.
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second nature
A mindset, skill, or type of behavior so ingrained through habit or practice that it seems natural, automatic, or without a basis in conscious thought.
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second string
Not as good; of a lower quality or condition.