Synonyms of 'reminder'
promptDictionary, prompting, cue
They are about to be given a sharp reminder.
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In the theatre or in a musical performance, a performer's cue is something another performer says or does that is a signal for them to begin speaking, playing, or doing something.
He took this as his cue to leave.
The challenge appealed to him. All he needed was a little nudge.
Thesaurus for reminder from the Collins English Thesaurus
Something that serves as a reminder of another thing makes you think about the other thing.