lose sight of

[lose sight of] {v. phr.} 1. Not to be able to see any longer.

Ilost sight of Mary in the crowd.

I watched the plane go higher andhigher until I lost sight of it.

Contrast: CATCH SIGHT OF. 2. Toforget; overlook.

Johnny was so interested in the game he lostsight of the time.

No matter how rich and famous he became, henever lost sight of the fact that he had been born in the slums.