nuts and bolts »
The basic, inner workings of something; the fundamentals or basics; that which makes something operate, on a basic level.
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nutty as a fruitcake »
Behaving in an eccentric, foolish, or kooky manner; very nutty.
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off one's game »
Performing in any activity below one's usual level; behaving in an irregular, inept, or awkward manner; feeling unwell.
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off the hook »
Of a telephone, having an open connection; not hung up.
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off the rails »
In an abnormal manner, especially in a manner that causes damage or malfunctioning.
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on course »
Proceeding smoothly as planned.
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on the clock »
Working at one's job; occupied in some manner during one's hours of remunerated employment.
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on the sly »
Slyly, in an inconspicuous manner, so as not to be seen; secretly; stealthily.
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on track »
Proceeding as planned, as expected, or in a manner consistent with an established pattern.
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out of house and home »
In a manner that deprives one of dwelling or some aspect thereof.
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out of line »
Inappropriate or unsuitable, especially by reason of being unmannerly or indelicate.
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out of nowhere »
In an unexpected or inexplicable manner of arrival or occurrence.
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overkill »
An unnecessary excess of whatever is needed to achieve a goal.
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pachyderm »
A member of the obsolete taxonomic group Pachydermata, grouping of thick-skinned, hoofed animals such as the rhinoceros, hippopotamus, elephant, pig and horse.
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packing heat »
Carrying one or more firearms on one's person, especially in a concealed manner.
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