noun
knockers
noun
1
Vulgar slang for a woman's breasts.
"The comment about her knockers was completely out of line."
How to Use Knockers
Learner’s notesIn plain EnglishCrude slang for breasts.
When to use it
Vulgar and often considered disrespectful — avoid in professional settings.
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The comment about her _____ was completely out of line.
Etymology
From knock plus -er, in use with this slang meaning since around the 1940s.