Longman Dictionary of Contemporary English homepage

front line

 noun
     
front line
1 [countable usually singular] the place where fighting happens in a war [= front]
in/on the front line
troops who had served in the front line at Magdeburg
three miles behind the front line
2

in the front line

a) doing something that has not been done before:
in the front line of the fight against cancer
b) likely to be blamed for an organization's mistakes
—front-line adjective [only before noun]
front-line troops
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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