Children should behave well and be quiet, especially in the presence of adults.

(euphemistic, of a person or thing) To be in poor condition, to be worn out.

(idiomatic, of persons, things, ideas, etc.) To be at the point in a life cycle or career of no longer being useful or effective; to be worn-out.

past participle of see the trees through the forest

present participle of have seen one's day

Third-person singular simple present indicative form of have seen one's day

simple past tense and past participle of have seen one's day

past participle of raise the flag and see who salutes

Repulsive, disturbing, or horrific sights can never be erased from memory once they have been seen.

Alternative form of what has been seen cannot be unseen