Plural of bail; plural forms of removable rods in cricket wickets, or plural of security payments made to free someone from jail temporarily.
From Old French 'baile,' originally meaning custody or guardianship, with the plural forming in English through standard '-s' addition.
The cricket bail is a wonderful example of how old legal vocabulary got repurposed in sports—the wooden rod 'bails' out when hit, sharing the escape metaphor with legal bail.
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