embrasure

incision indentation

cavity crater crenel cut dimple dint dip furrow hollow impression nick notch pit scallop score scratch sink trough

con-cavity

increase

bulge

alcove ambush angle apse bay break carrel cavity cell closet cove cranny crutch crypt cubicle dent depression depths fork heart hole hollow indentation mouth nook opening oriel penetralia reaches retreat slot socket

hiding place secret place

bulge closure misfortune solid

continuation