Having one thing coming rapidly after another.(adjective)
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Use "quick-fire" in a sentence
"I usually ignore these quick-fire conversations (most of the time I don't have a clue what they're talking about) but today I can actually add something because I was there."
"It's a decent effort Rutger, but we've got two quick-fire substitutions that can beat six minutes."
"Its DNA has been geared up for deliberate, careful changes, rather than dramatic, quick-fire decisions."