on the dot meaning

Adverb: on the dot

1. Just as it should be
   - precisely, exactly, on the nose, on the button

[American idiom]
at exactly the right time. (Informal.)
• I'll be there at noon on the dot.
• I expect to see you here at eight o'clock on the dot.

[American slang]
Fig. at exactly the right time. (Typically: be somewhere ~; arrive (somewhere) ~; get somewhere ~; see someone ~; show up ~.)
  I'll be there at noon on the dot.
  I expect to see you here at eight o'clock on the dot.

Examples

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1. he is very punctual -- always arrives on the dot ..
2. major shairpe, much spruced up and wearing a pith helmet, arrived on the dot of nine.
3. please click on the dot to view the detail information
4. yes, we were both there on the dot
5. the train arrived on the dot of three o'clock