1.
You use ~ to emphasize that you are referring to an exact thing, rather than something vague.
I can remember the ~ moment when my daughter came to see me and her new baby brother in hospital...
The ~ location of the wreck was discovered in 1988...
He was not clear on the ~ nature of his mission...
= exact
ADJ: ADJ n emphasis
2.
Something that is ~ is exact and accurate in all its details.
He does not talk too much and what he has to say is ~ and to the point.
ADJ
3.
You say ‘to be ~’ to indicate that you are giving more detailed or accurate information than you have just given.
More than a week ago, Thursday evening to be ~, Susanne was at her evening class...
PHRASE: cl/group PHR