remain on meaning

[American slang]
Go to on (one's) guard (against so or sth)

• remain:    Verb: remain  ...
• remain in:    [American slang]1. ...
• remain ahead:    [American slang]Go ...

Examples

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1. the distal duodenum and jejunum remain on the right side of the spine.
2. after the mandrel is melted, a thin layer of alloy remains on the propellant surface.
3. of course i remain on terms of perfect confidence with tom—and he is quite of my opinion.
4. by about the 43rd day his stamina was ebbing, and he couldn't remain on his feet more than six or seven hours a day.
5. passengers travelling on are asked to remain on board