lying-in lyin·gin uncommon noun 1. concluding state of pregnancy; from the onset of labor to the birth of a child “she was in labor for six hours” Synonymsparturiencylaborlabourconfinementtravailchildbed Related words Word family labourlabor Broader terms parturition Narrower terms premature labor Parts pregnancy Part of uterine contractioneffacementasynclitism WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.