"invalids" in the noun sense
1. invalid, shut-in
someone who is incapacitated by a chronic illness or injury
"invalids" in the verb sense
1. invalid
force to retire, remove from active duty, as of firemen
2. disable, invalid, incapacitate, handicap
injure permanently
"He was disabled in a car accident"
Source: WordNet® (An amazing lexical database of English)
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