1) to take rest together with
2) to sleep together with, to lie with
2a) of a husband and wife
2b) metaphorically to rest or refresh one's spirits with one (i.e. to give and get refreshment by mutual intercourse)
Part of Speech: verb
Middle voice from G4862 and G373; to recruit oneself in company with: - refresh with.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root συναναπαύομαι; click on the second column to search for that grammatical form of the root συναναπαύομαι; click on the third column to search for that word and grammatical form; click on the total to search for the root συναναπαύομαι.