The term 'settle down' can be broken down into eight crossword solutions: ROOST (5 letters), NESTLE (6 letters), LAND (4 letters), CALM (4 letters), ABATE (5 letters), NEST (4 letters), MARRY (5 letters), and ALIGHT (6 letters). ROOST is a verb meaning to rest or stay in a particular place, while NESTLE means to settle comfortably in a place. LAND is a noun referring to the solid surface of the earth, and CALM is an adjective describing a state of peace and quiet. ABATE is a verb meaning to reduce in intensity or degree, and NEST is a noun referring to a comfortable home or resting place. MARRY is a verb meaning to join together in a close union, and ALIGHT is a verb meaning to come down and rest. Finally, coolit is an informal phrase meaning to CALM down or relax. All of these words and phrases relate to the idea of settling down, either physically or emotionally.