Crack-up and Queer duck

Crack-up noun - A mental or nervous collapse.

Queer duck and crack-up are semantically related. In some cases you can use "Queer duck" instead a noun phrase "Crack-up".

Queer duck noun - Someone regarded as eccentric or crazy and standing out from a group.

Crack-up and queer duck are semantically related. Sometimes you can use "Crack-up" instead a noun phrase "Queer duck".