Engaged (baby)

Background
At around week 36 of pregnancy (usually between weeks 34 - 38), as the baby’s head sinks into its mother's pelvis, it becomes ‘engaged’, meaning s/he is set for birth, and will not be able to rise out of the pelvis to turn any more. The midwife will check how much of the baby’s head can still be felt above the pelvis. Once nothing can be felt, the baby is fully engaged.

Source
Mothercare website