: behavior made involuntary or automatic by repeated practice
said no from force of habit
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behavior occurring without thought and by virtue of constant repetition; habit.
[1920-25]
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force of ˈhabit idiom
if you do sth from or out of force of habit, you do it automatically and in a particular way because you have always done it that way in the past
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It's force of habit that gets me out of bed at 6.15 each morning.
Useful english dictionary. 2012.