hammer up
中級 (B1) neutral
To fix something to a wall or surface by hammering nails into it.
"They hammered up a 'For Sale' sign in the front garden."
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The Incredibly Unique Triple Barreled Pistol... - Smarter Every Day 304
SmarterEveryDay · 6:02
And then once the powder goes, it blows the hammer up.
The Incredibly Unique Triple Barreled Pistol... - Smarter Every Day 304
SmarterEveryDay · 5:33
ignites] [D] As soon as it hits, look, the cap blows the hammer up.