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O
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on one's lonesome
alone or by oneself
on one's mind
currently occupying someone's thoughts
on one's tod
Alone or by oneself.
on one's toes
Alert and ready for action.
on one's watch
during someone's time in charge
on one's way out
About to leave, or soon to disappear or become unpopular.
on opposite sides of the barricades
in conflict or disagreement
on pins and needles
feeling anxious or nervous
on purpose
Done intentionally.
on second thought
After reconsideration or reflection.
on short notice
With very little warning or time to prepare.
on sight
immediately upon seeing something
on solid ground
in a secure or stable situation
on someone's dime
paid for by someone else
on someone's doorstep
right in front of someone's home
on someone's hands
in the care or responsibility of a person
on someone's mind
Occupying a person's thoughts.
on someone's radar
being noticed or considered by a person
on steroids
extremely enhanced or exaggerated.
on strike
refusing to work to demand change
on stun
in a temporary, non-lethal weapon mode
on sufferance
With implied permission, often reluctantly.
on talking terms
Able to communicate without conflict.
on tenterhooks
Anxiously waiting for something to happen.