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Almost; nearly. I would do just about anything for a cool drink right now. The project is just about done—I just have to do some final editing. The main act didn't take the stage until just about 9:30.
Almost, very nearly, as in This job is just about done, or At just about midnight we'll uncork the champagne. This phrase is sometimes used alone, as in Are you finished yet?-Just about. It uses about in the sense of "nearly," a usage dating from the early 1600s.
1 almost; nearly: I’ve just about finished my essay. ♢ ‘Do you feel all right?’ ‘I suppose so, just about.’
2 approximately; about: The company has lost just about a million pounds this year. ♢ It was just about midnight when they arrived.
Almost; very nearly: This job is just about done.