An armchair is defined as a chair that has supports on the sides so a person sitting in it can rest his arms.(noun)
An example of an armchair is a recliner.
The definition of armchair are concepts or ideas which are not based on direct involvement or experience.(adjective)
An example of armchair knowledge is someone who learns about a country by reading travel books.
See armchair in Webster's New World College Dictionary
See armchair in American Heritage Dictionary 4
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