The difference between Better half and Other half
When used as nouns, better half means a person's spouse or lover, most commonly a man's wife. generally jocular, but may be complimentary or as a sign of respect, whereas other half means a spouse.
check bellow for the other definitions of Better half and Other half
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Better half as a noun (idiomatic):
A person's spouse or lover, most commonly a man's wife. Generally jocular, but may be complimentary or as a sign of respect.
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Better half as a noun (idiomatic, archaic):
A very close friend or companion
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Other half as a noun (idiomatic):
A spouse.