Tip of the spear
Meaning
The most aggressive or forward position.
Usage
Used when describing pioneering units.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Military metaphor about the spearhead penetrating first.
Adopted in the 20th century from warfare.