meaning of give a lead
All surveys released on Saturday gave Rousseff a lead of between 10 and 13 percentage points,following a televised debate between the candidates late on Friday.
what dose this paragraph mean?
what dose the meaning of give a lead

Question

Answer

The "lead" is referring to a race (competition), for a position, where Rousseff is ahead (in front of the competition) by 10-13 percentage points.

Answer

'Giving a lead' means showing that person as having a lead.  It is a little contradictory, if you think about it, because the survey itself doesn't 'give' a person a lead - the people being surveyed give the lead.   It is a figure of speech and such uses often don't make perfect sense.

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