a woman who has sex with men for money, especially one who arranges her meetings by telephone.

His ex-wife claimed that call girls had visited his apartment each week.

• knock something on the head
• knock something out
• knock something's socks off
• knock spots off
• knock spots off someone
• knock spots off something
• knock the bottom out of
• knock the bottom out of something
• knock the daylights out of
• knock the daylights out of someone
• knock the living daylights out of
• knock the living daylights out of someone
• knock them dead
• knock the stuffing out of
• knock the stuffing out of someone
• knock the tar out of
• knock the tar out of someone
• knock up
• knock wood
• knock yourself out
• knock your socks off
• know-all
• know a thing or two
• know backwards
• know backwards and forwards