Used other than figuratively or idiomatically: see on, one, knee. / (idiomatic) At the mercy of someone.

(literally) Being seen or targeted, often through the sights of a weapon. / (figuratively) The target or object of one's efforts or ambitions. / (figuratively) Still achievable.

That keeps promises and tells the truth.

(idiomatic) extremely desperately

(idiomatic) In one's opinion, from one's point of view.

(idiomatic, Northern England) Alone, on one's own.

Used other than figuratively or idiomatically: see on, plate. / (of one or more matters of concern) To be dealt with or handled.

At one’s convenience.

In a watchful state; alert; vigilant.

That one has chosen, or wishes to choose.