to be waiting and ready to do something or to help做好准备(行动或提供帮助)
More examples
Police in riot gear were standing by in case the demonstration got out of control.
The pilot told the cabin crew to stand by for take-off.
I'll be standing by in case you need me for anything.
Could you stand by in case I need help?
Fire fighters were standing by in case of emergencies.
to allow something unpleasant to happen without doing anything to stop it袖手旁观
See also: stand by sb
See also: stand by sth
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