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second-class
second-class citizen
Second Coming
second cousin
second crop
second cut
second cutting
second-degree burn
second down
Second Empire
second estate
second fiddle
second generation
second growth
second-guess
second hand
second-in-command
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second nature

sec·ond na·ture


noun 
Definition:
 
ingrained habit: a habit or tendency so well-developed and long-practiced that it seems to be done unconsciously

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