1.Lit. to have one's vision of someone or something fade because of distance or an obstruction. I lost sight of Alice as she walked into the distance.We lost sight of the ship as it sailed out of the harbor.
2.Fig. to forget to consider someone or something. Don't lose sight of Alice and her basic contributions.Don't lose sight of the basic value of the land on which the house sits.
to stop considering something Members of the peace-keeping force have lost sight of the fact that they are here to help people.Despite the very personal nature of her work, she never lost sight of the larger community her work would benefit.
Usage notes: usually said about an important fact or idea
to forget about an important idea or a fact because you are thinking too much about other things Some members of the peace force seem to have lost sight of the fact that they are here to help people.
Overlook, fail to take into account, as in We must not lose sight of our main objective, or Beverly never lost sight of her humble beginnings. This metaphoric expression alludes to physical sight. [Early 1700s] For an antonym, see bear in mind.