1. : to preserve as a unit : keep from separating into component parts
: preserve from disintegrating or failing
are of different inspirations but all held together by a remarkable unity — American Guide Series: Connecticut
2. : to keep from nervous or mental collapse
: to remain loyal to each other : preserve a unanimity of feeling or action
we have only to hold together to go safely through the dark valley — Sir Winston Churchill
Useful english dictionary. 2012.