off-chance - just in case
on second thoughts - after re-consideration
on a whim - impulsively
on a budget - with a limited amount of money
on principle - due to a belief
on one's own - independently
on target - as planned
on duty - working
on purpose - intentionally
on condition that - only if
off-chance - just in case
on second thoughts - after re-consideration
on a whim - impulsively
on a budget - with a limited amount of money
on principle - due to a belief
on one's own - independently
on target - as planned
on duty - working
on purpose - intentionally
on condition that - only if