1) to pour out as a drink offering, make a libation
2) in the NT to be offered as a libation
3) fig. used of one whose blood is poured out in a violent death for the cause of God
Part of Speech: verb
Citing in TDNT: 7:528,*
Apparently a primary verb; to pour out as a libation, that is, (figuratively) to devote (one's life or blood, as a sacrifice) ("spend"): - (be ready to) be offered.
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 σπένδομαι; click on the second column to search for that grammatical form of the root σπένδομαι; click on the third column to search for that word and grammatical form; click on the total to search for the root σπένδομαι.