In every part; throughout; completely. * /David knows the parts of his bicycle inside out./ * /We searched the house inside and out for the kitten./ Compare: BACKWARDS AND FORWARDS, INS AND OUTS, THROUGH AND THROUGH.
{adv. phr.} 1. Coming in and going out often. * /He was very busy Saturday and was in and out all day./ 2. See: INSIDE OUT(2).