"Knockin" is a shortened way of saying "knocking," which means to hit or tap on something, usually a door, with your hand or a closed fist to get someone's attention or to ask for entry. Full definition
Store these mini treats in a container in the fridge and pop one out when cravings come knockin». (theglowingfridge.com)
These data suggest that increased inhibitory synaptic transmission may contribute to human ASDs and that the R451C knockin mice may be a useful model for studying autism - related behaviors. (science.sciencemag.org)
If you've read any of our author interviews, you know that here at Knockin» Books, we're a little obsessed with zombie apocalypse books, movies and shows. (knockinbooks.com)